prompt_front: Answer the question based on the given passages. Only give me the answer and do not output any other words.

Question: The 1958 Pro Bowl was played at the California stadium that is the home for which college?

The following are given passages.
Context 1: Passage 1:
1958 Pro Bowl
The 1958 Pro Bowl was the NFL's eighth annual all-star game which featured the outstanding performers from the 1957 season  The game was played on January 12, 1958, at the Los Angeles Memorial Coliseum in Los Angeles, California in front of 66,634 fans  The West squad defeated the East by a score of 26–7 The West team was led by the Detroit Lions' George Wilson while Buddy Parker of the Pittsburgh Steelers coached the East squad  San Francisco 49ers running back Hugh McElhenny was selected as the outstanding back of the game and defensive end Gene Brito of the Washington Redskins was named the outstanding lineman This was the first Pro Bowl to be televised nationally (except in the Los Angeles market where it was blacked out) 
Passage 2:
Los Angeles Memorial Coliseum
The Los Angeles Memorial Coliseum (also known as the L A  Coliseum) is a multi-purpose stadium in the Exposition Park neighborhood of Los Angeles, California  Conceived as a hallmark of civic pride, the Coliseum was commissioned in 1921 as a memorial to Los Angeles veterans of World War I  Completed in 1923, it will become the first stadium to have hosted the Summer Olympics three times when it hosts the 2028 Summer Olympics; the stadium previously hosted the Summer Olympics in 1932 and 1984  It was designated a National Historic Landmark on July 27, 1984, a day before the opening ceremony of the 1984 Summer Olympics The stadium serves as the home of the University of Southern California Trojans football team of the Pac-12 Conference, and is located directly adjacent to the school’s main University Park campus 
The Coliseum is jointly owned by the State of California's Sixth District Agricultural Association, Los Angeles County, and the city of Los Angeles  It is managed and operated by the Auxiliary Services Department of the University of Southern California (USC) USC granted naming rights to United Airlines in January 2018  After concerns were raised by the Coliseum Commission, which has public oversight of USC's management and operation of the Coliseum, the airline agreed to become the title sponsor of the playing field, naming it United Airlines Field at the Los Angeles Memorial Coliseum The Coliseum was the home of the Los Angeles Rams of the National Football League (NFL) from 1946 to 1979, when they moved to Anaheim Stadium in Anaheim, and again from 2016 to 2019, prior to the team's move to SoFi Stadium in Inglewood  The facility had a permanent seating capacity of 93,607 for USC football and Rams games, making it the largest football stadium in the Pac-12 Conference and the NFL  The stadium also was the temporary home of the Los Angeles Dodgers of Major League Baseball (MLB) from 1958 to 1961, and was the host venue for games three, four, and five of the 1959 World Series  It was the site of the first AFL-NFL World Championship Game (later called Super Bowl I) and Super Bowl VII  Additionally, it has served as a home field for a number of other teams, including the 1960 inaugural season for the Los Angeles Chargers, the Los Angeles Raiders of the NFL from 1982 to 1994, and UCLA Bruins football  
From 1959 to 2016, the Los Angeles Memorial Sports Arena was located adjacent to the Coliseum before it closed in March 2016  BMO Stadium, formerly Banc of California Stadium, a soccer-specific stadium and the home of Major League Soccer (MLS)'s Los Angeles FC, was constructed on the former Sports Arena site, and opened in 2018 
In 2019 USC completed a two year long major renovation of the stadium that included replacing the seating along with the addition of luxury boxes and club suites   The $315 million project, funded solely by the university and managed by architectural firm DLR Group, was the first major upgrade of the stadium in twenty years  The improvements and added amenities resulted in a reduced stadium capacity from 92,348 to 77,500 

Operation
The Los Angeles Memorial Coliseum Commission, which consists of six voting members appointed by the three ownership interests and meets on a monthly basis, provides public oversight of the master lease agreement with USC  Under the lease, the University has year-round day-to-day management and operation responsibility for both the Coliseum and BMO Stadium properties  USC's Vice President of Auxiliary Services is also the Chief Operating Officer of the Los Angeles Memorial Coliseum, and Coliseum employees are employees of the university  Until 2013, USC had a series of mostly one and two year agreements with the Coliseum Commission – which up to that time had been directly operating the stadium  Those agreements were limited to the University only renting the stadium for USC home football games  On July 29, 2013, after the previously governing Coliseum Commission failed to deliver promised renovations, the Coliseum Commission and USC implemented a significantly more extensive master lease agreement that transferred to USC the responsibility for the long-term management and operation of both the Coliseum and the adjacent BMO Stadium property and the capital renewal of the Coliseum  The 98-year agreement required the University to make approximately $100 million in initial physical repairs to the Coliseum  Additionally, it requires USC pay $1 3 million each year in rent to the State of California for the state-owned land the property occupies in Exposition Park; maintain the Coliseum's physical condition at the same standard used on the USC Campus; and assume all financial obligations for the operations and maintenance of the Coliseum and BMO Stadium Complex 

USC
The Coliseum is primarily the home of the USC Trojans football team  Most of USC's regular home games, especially the alternating games with rivals UCLA and Notre Dame, attract a capacity crowd  The current official capacity of the Coliseum is 77,500, with 42 suites, 1,100 club seats, 24 loge boxes, and a 500-person rooftop terrace  USC's women lacrosse and soccer teams use the Coliseum for selected games, usually involving major opponents and televised games  USC also rents the Coliseum to various events, including international soccer games, musical concerts and other large outdoor events In May 2021, due to the previous year of local COVID-19 restrictions, USC held commencement ceremonies in the Coliseum for graduating students from the classes of 2020 and 2021  Ceremonies were held in the Coliseum twice a day for a week, with over 36,000 diplomas (including undergraduate and graduate degrees and certificates) were awarded  It was the first time in 70 years that USC had held its commencement in the stadium 

History
Planning
The Coliseum was commissioned in 1921 as a memorial to L A  veterans of World War I (rededicated to all United States veterans of the war in 1968)  The groundbreaking ceremony took place on December 21, 1921, with construction being completed in just over 16 months, on May 1, 1923  Designed by John and Donald Parkinson, the original bowl's initial construction costs were $954,873  When the Coliseum opened in 1923, it was the largest stadium in Los Angeles, with a capacity of 75,144  In 1930, however, with the Olympics due in two years, the stadium was extended upward to seventy-nine rows of seats with two tiers of tunnels, expanding the seating capacity to 101,574  The physical structure of a bowl-shaped configuration for the Coliseum was undoubtedly inspired by the earlier Yale Bowl which was built in 1914  The now-signature Olympic torch was added, and the stadium was briefly known as Olympic Stadium  The Olympic cauldron torch which burned through both Games remains above the peristyle at the east end of the stadium as a reminder of this, as do the Olympic rings symbols over one of the main entrances  The football field runs east to west with the press box on the south side of the stadium 
The current jumbotrons to each side of the peristyle were installed in 2017, and replaced a scoreboard and video screen that towered over the peristyle dating back to 1983; they replaced a smaller scoreboard above the center arch installed in 1972, which in turn supplanted the 1937 model, one of the first all-electric scoreboards in the nation  Over the years new light towers have been placed along the north and south rims  The large analog clock and thermometer over the office windows at either end of the peristyle were installed in 1955  In the mid- and late 1950s, the press box was renovated, and the "Los Angeles Memorial Coliseum" lettering and Olympic rings, lighted at night, were added to the eastern face of the peristyle tower  Between the double peristyle arches at the east end is the Coliseum's "Court of Honor" plaques, recognizing many of the memorable events and participants in its  history, including a full list of 1932 and 1984 Olympic gold medalists (the complete roster of honorees can be seen below) 

Renovations
For many years, the Coliseum was capable of seating over 100,000 spectators  In 1964, the stadium underwent its first major renovation in over three decades  Most of the original pale green wood-and-metal bench seating was replaced by individual theater-type chairs of dark red, beige and yellow; these seats remained until 2018, although the yellow color was eliminated in the 1970s  The seating capacity was reduced to approximately 93,000 
The Coliseum was problematic as an NFL venue  At various times in its history, it was either the largest or one of the largest stadiums in the league  While this allowed the Rams and Raiders to set attendance records, it also made it extremely difficult to sell out  The NFL amended its blackout rule to allow games to be televised locally if they were sold out 72 hours before kickoff  However, due to the Coliseum's large size, Rams (and later Raiders) games were often blacked out in Southern California, even in the teams' best years 
From 1964 to the late 1970s, it was common practice to shift the playing field to the closed end of the stadium and install end zone bleachers in front of the peristyle, limiting further the number of seats available for sale  For USC–UCLA and USC-Notre Dame games, which often attracted crowds upward of 90,000, the bleachers were moved eastward and the field was re-marked in its original position  When a larger east grandstand was installed between 1977 and 1978, at the behest of Rams owner Carroll Rosenbloom, the capacity was just 71,500  With the upcoming 1984 Summer Olympic Games, a new track was installed and the playing field permanently placed inside it  However, the combination of the stadium's large, relatively shallow design, along with the presence of the track between the playing field and the stands, meant that some of the original end zone seats were as far from the field by the equivalent length of another football field  To address these and other problems, the Coliseum underwent a $15 million renovation before the 1993 football season, which included the following:
The field was lowered by 11 feet (3 4 m) and 14 new rows of seats replaced the running track, bringing the first row of seats closer to the playing field (a maximum distance of 54 feet (16 5 m) at the eastern 30-yard-line) 
A portable seating section was built between the eastern endline and the peristyle bleachers (the stands are removed for concerts and similar events) 
The locker rooms and public restrooms were "modernized "
The bleachers were replaced with individual seating Additionally, for Raiders home games, tarpaulins were placed over seldom-sold sections, reducing seating capacity to approximately 65,000  The changes were anticipated to be the first of a multi-stage renovation designed by HNTB that would have turned the Coliseum into a split-bowl stadium with two levels of mezzanine suites (the peristyle end would have been left as is)  However, after the 1994 Northridge earthquake, the $93 million was required from government agencies (including the Federal Emergency Management Agency) to repair earthquake damage, and the renovations demanded by the Raiders were put on hold indefinitely  The Raiders then redirected their efforts toward a proposed stadium at Hollywood Park Racetrack in Inglewood before electing to move back to the Oakland Coliseum prior to the 1995 NFL season  In 2000, Bentley Management Group (BMG) was hired as the project manager to complete work at the Coliseum and Sports Arena funded by FEMA  In addition to seismically bracing the Sports Arena while it remained open for events, BMG also coordinated the Coliseum's new press box elevator, various concession stands, restroom improvements, and concrete spalling repairs 

New videoboard
In August 2011, construction began on the Coliseum's west end on a new 6,000-square-foot (560 m2) HD video scoreboard, accompanying the existing video scoreboard on the peristyle (east end) of the stadium  The video scoreboard officially went into operation on September 3, 2011, at USC football's home opener versus the University of Minnesota, with the game being televised on ABC 

2018–2019 renovation project
After USC took over the Coliseum master lease in 2013, they began making plans for major renovations needed and as stipulated in the master lease agreement  On October 29, 2015, USC unveiled an estimated $270 million project for a massive renovation and restoration the Coliseum  The upgrades included: replacing all seats in the stadium, construction of a larger and modern press box (with new box suites, premium lounges, a viewing deck, a V I P  section, and the introduction of LED ribbon boards), adding new aisles and widening some seats, a new sound system, restoration and renaming of the peristyle to the Julia and George Argyros Plaza, stadium wide Wi-Fi, two new HD video jumbotrons, new concession stands, upgraded entry concourses, new interior and exterior lighting, modernization of plumbing and electrical systems, and a reduction in capacity of about 16,000 seats, with the final total at approximately 78,500 seats The plans were met with mixed reactions from the public  The Los Angeles 2028 Olympic bid committee contemplated additional renovations to support its bid On January 8, 2018, USC began the project to renovate and improve the Coliseum  The project, which was solely funded by the University, was completed by the 2019 football season, and was the first major upgrade of the stadium in 20 years  The project budget increased from the initial estimate of $270 million to $315 million mainly due to the tight construction schedule 

Naming rights
On January 29, 2018, Chicago-based United Airlines became the stadium's first naming rights partner  Originally, Memorial Coliseum was to be retained in the name of the stadium by the condition of the Coliseum Commission's requirement in its master lease agreement with USC  However, veterans groups and the new president of the Coliseum Commission raised concern about the new name, while United did not approve of any change from the stadium and stated that they were willing to step away from the deal On March 29, 2019, USC suggested the name United Airlines Field at Los Angeles Memorial Coliseum instead of the planned United Airlines Memorial Coliseum  Although United also did not support this and considered withdrawal, the two parties agreed to the name on June 7 During Los Angeles Rams home games for the 2019 season, the stadium reverted to its original name, and all signage indicating "United Airlines Field" was covered due to the franchise's sponsoring partnership with American Airlines 

Notable events
1920s
On October 6, 1923, Pomona College and USC played in the inaugural game at the Coliseum, with the Trojans prevailing 23–7  Situated just across the street from Exposition Park, USC agreed to play all its home games at the Coliseum, a circumstance that contributed to the decision to build the arena 
From 1928 to 1981, the UCLA Bruins also played home games at the Coliseum  When USC and UCLA played each other, the "home" team (USC in odd-numbered years, UCLA in even), occupied the north sideline and bench, and its band and rooters sat on the north side of the stadium; the "visiting" team and its contingent took to the south (press box) side of the stadium  Excepting the mid-1950s and 1983–2007, the two teams have worn their home jerseys for the rivalry games for the Victory Bell  This tradition was renewed in 2008, even though the two schools now play at different stadiums  UCLA moved to the Rose Bowl in Pasadena in 1982 

1930s–1940s
In 1932, the Coliseum hosted the Summer Olympic Games, the first of two Olympic Games hosted at the stadium  The Coliseum served as the site of the field hockey, gymnastics, the show jumping part of the equestrian event, and track and field events, along with the opening and closing ceremonies  The 1932 games marked the introduction of the Olympic Village, as well as the victory podium The former Cleveland Rams of the National Football League relocated to the Coliseum in 1946, becoming the Los Angeles Rams; however, the team later relocated again, first to Anaheim in 1980, then to St Louis in 1995, only to move back to Los Angeles in 2016  The Los Angeles Dons of the All-America Football Conference played in the Coliseum from 1946 to 1949, when the franchise merged with its NFL cousins just before the two leagues merged  The Coliseum hosted the NCAA Men's Division I Outdoor Track and Field Championships in 1934, 1939, 1949, and 1955  It also hosted several Coliseum Relays and several Compton-Coliseum Invitational (track and field) events from the 1940s until the 1970s 

1950s–1960s
Among other sporting events held at the Coliseum over the years were Major League Baseball (MLB) games, which were held when the Brooklyn Dodgers of the National League relocated to the West Coast in 1958  The Dodgers played here until Dodger Stadium was completed in time for the 1962 season  Even allowing for its temporary status, the Coliseum was extremely ill-suited for baseball due to the fundamentally different sizes and shapes of football and baseball fields  A baseball field requires roughly 2 5 times more area than a football gridiron, but the playing surface was just barely large enough to accommodate a baseball diamond  As a result, foul territory was almost nonexistent down the first base line, but was expansive down the third base line, with a very large backstop for the catcher  Sight lines also left much to be desired; some seats were as far as 710 feet (216 m) from the plate  Also, from baseball's point of view, the locker rooms were huge as  they were designed for football (not baseball) teams 
In order to shoehorn even an approximation of a baseball field onto the playing surface, the left-field fence was set at only 251 feet (77 m) from the plate  This seemed likely to ensure that there would be many "Chinese home runs", as such short shots were called at the time  Sportswriters began jokingly referring to the improvised park as "O'Malley's Chinese Theatre" or "The House that Charlie Chan Built", drawing protests from the Chinese American community in the Los Angeles area  They also expressed concern that cherished home run records, especially Babe Ruth's 1927 seasonal mark of 60, might easily fall as a result of 250-foot (76 m) pop flies going over the left-field fence  Sports Illustrated titled a critical editorial "Every Sixth Hit a Homer!" Players also complained, with Milwaukee Braves ace Warren Spahn calling for a rule that would require any home run to travel at least 300 feet (91 m) before it could be considered a home run Baseball Commissioner Ford Frick ordered the Dodgers to erect a 42 feet (12 8 m) screen in left field to prevent pop flies from becoming home runs  Its cables, towers, wires, and girders were in play  The "short porch" in left field looked extremely attractive to batters  In the first week of play during the 1959 season, the media's worst preseason fears seemed to be realized when 24 home runs were hit in the Coliseum, three of them by Chicago Cubs outfielder Lee Walls, not especially distinguished as a hitter  However, pitchers soon adapted, throwing outside to right-handed hitters, requiring them to pull the bat hard if they wanted to hit toward left  Perhaps no player took better advantage than Dodgers outfielder Wally Moon, who figured out how to hit high fly balls that dropped almost vertically just behind the screen  By the end of the season, he had hit 19 homers, all but five of them in the Coliseum  In recognition, such homers were dubbed "Moon Shots" Nonetheless, the number of home runs alarmed Frick enough that he ordered the Dodgers to build a second screen in the stands, 333 ft (101 m) from the plate  A ball would have had to clear both screens to be a home run; if it cleared the first, it would have been a ground-rule double  However, the Dodgers discovered that the earthquake safety provisions of the Los Angeles building code forbade construction of a second screen Unable to compel the Dodgers to fix the situation, the major leagues passed a note to Rule 1 04 stating that any stadium constructed after June 1, 1958, must provide a minimum distance of 325 feet (99 m) down each foul line  Also, when the expansion Los Angeles Angels joined the American League in 1961, Frick rejected their original request to use the Coliseum as a temporary facility  This rule was revoked (or perhaps, simply ignored) when the Baltimore Orioles launched the "retro ballpark" era in 1992, with the opening of Oriole Park at Camden Yards  With a right field corner of only 318 feet (97 m), this fell short  However, baseball fans heartily welcomed the "new/old" style, and all new ballparks since then have been allowed to set their own distances 

Late that season, the screen figured in the National League pennant race  When the Braves were playing the Dodgers at the Coliseum on September 15, 1959, Joe Adcock hit a ball that cleared the screen but hit a steel girder behind it and got stuck in the mesh  According to  ground rules, this should have been a home run  However, the umpires ruled it a ground-rule double  The fans shook the screen, causing the ball to fall into the seats  The umpires changed the call to a homer, only to rule it a ground-rule double while Adcock was left stranded on second  The game was tied at the end of nine innings, and the Dodgers won in the tenth inning  At the end of the regular season, the Dodgers and Braves finished in a tie  The Dodgers won the ensuing playoff and went on to win the World Series 
Although less than ideal for baseball due to its poor sight lines and short dimensions (left field at 251 feet (77 m) and power alleys at 320 feet (98 m)), the Coliseum was ideally suited for large paying crowds  Each of the three games of the 1959 World Series drew over 92,000 fans, with game five drawing 92,706, a record unlikely to be seriously threatened anytime soon given the smaller seating capacities of today's baseball parks  In May 1959, an exhibition game between the Dodgers and the New York Yankees in honor of legendary catcher Roy Campanella drew 93,103, the largest crowd ever to see a baseball game in the Western Hemisphere until a 2008 exhibition game between the Los Angeles Dodgers and the Boston Red Sox to mark the 50th anniversary of MLB in Los Angeles  The Coliseum also hosted the second 1959 MLB All-Star Game 
The Coliseum was also the site of John F  Kennedy's memorable acceptance speech at the 1960 Democratic National Convention  It was during that speech that Kennedy first used the term "the New Frontier" 

The Rams hosted the 1949, 1951 and 1955 NFL championship games at the Coliseum  The Coliseum was also the site of the very first NFL-AFL Championship Game in 1967, an event since renamed the Super Bowl  It also hosted Super Bowl VII in 1973, but future Super Bowls in the Los Angeles region would instead be hosted at the Rose Bowl, which has never had an NFL tenant  The Coliseum was also the site of the NFL Pro Bowl from 1951 to 1972, and again in 1979  In 1960, the American Football League (AFL)'s Los Angeles Chargers played at the Coliseum before relocating to San Diego the next year; the team moved back to the L A  area in 2017 
The United States men's national soccer team played its first match at the stadium in 1965, losing to Mexico in a 1966 World Cup qualifier  Also, the Los Angeles Wolves of the United Soccer Association played their home games at the Coliseum for a year (1967) before moving to the Rose Bowl 

1970s–1980s
In June 1970, the first Senior Olympics (known as the Senior Sports International Meet) took place at the Los Angeles Memorial Coliseum In July 1972, the Coliseum hosted the "Super Bowl" of Motocross  The event was the first motocross race held inside a stadium  It evolved into the AMA Supercross championship held in stadiums across the United States and Canada  The Coliseum last hosted the event in 1998 On August 20, 1972, Wattstax, also known as "Black-Woodstock", took place in the Coliseum  Over 100,000 black residents of Los Angeles attended this concert for African-American pride  Later in 1973, a documentary was released about the concert 
In 1973, Evel Knievel used the entire distance of the stadium to jump 50 stacked cars  Knievel launched his motorcycle from atop one end of the Coliseum, jumping the cars in the center of the field, and stopping high atop the other end  The jump was broadcast on ABC's Wide World of Sports  Also in 1973, the Coliseum was host to Super Bowl VII, which saw the AFC champion Miami Dolphins defeat the NFC champion Washington Redskins 14–7, becoming the only team in NFL history to attain an undefeated season and postseason 
The Mickey Thompson Entertainment Group hosted the first stadium short course off-road race at the Coliseum in 1979  The event was last held in 1992 
The Los Angeles Rams played their home games in the Coliseum until 1979, when they moved to Anaheim prior to the 1980 NFL season  They hosted the NFC Championship Game in 1975 and 1978, in which they lost both times to the Dallas Cowboys by lopsided margins 
The Los Angeles Aztecs of the North American Soccer League used the Coliseum as their home ground in 1977 and 1981 
The Coliseum was also home to the USFL's Los Angeles Express between 1983 and 1985  In this capacity, the stadium also is the site of the longest professional American football game in history: on June 30, 1984 (a few weeks before the start of the 1984 Summer Olympics), a triple-overtime game between the Express and the Michigan Panthers that was decided on a 24-yard game-winning touchdown by Mel Gray of the Express, three and a half minutes into the third overtime, to give Los Angeles a 27–21 win  Until 2012, this game marked the only time in the history of professional football that there was more than one kickoff in overtime play in the same game In 1982, the former Oakland Raiders moved in  The same year, UCLA decided to move out, relocating its home games to the Rose Bowl in Pasadena 

The Coliseum was also the site of the 1982 Speedway World Final, held for the first and only time in the United States  The event saw Newport Beach native Bruce Penhall retain the title he had won in front of 92,500 fans at London's Wembley Stadium in 1981  An estimated 40,000 fans were at the Coliseum to see Penhall retain his title before announcing his retirement from motorcycle speedway to take up an acting role on the television series CHiPs 
Los Angeles hosted the 1984 Summer Olympics, and the Coliseum became the first stadium to host the Summer Olympic Games twice, again serving as the primary track and field venue and as the site of the opening and closing ceremonies The Coliseum played host to the California World Music Festival on April 7–8, 1979 The Rolling Stones played at the stadium on their 1981 Tattoo You tour (October 9 and 11), supported by George Thorogood, the J  Geils Band, and relatively unknown newcomer Prince Stones played for 90 000 for each of 2 nights in 1981 and a record 90 000 fans for 4 nights in 1989 

The Argentina national soccer team played a friendly match against Mexico on May 14, 1985, as part of Argentina's tour of North America prior to the 1986 FIFA World Cup that would be won by the squad managed by Carlos Bilardo 
Bruce Springsteen and the E Street Band concluded their Born in the U S A  Tour with four consecutive concerts on September 27, 29, 30, and October 2, 1985, in front of 82 000 people each night  These shows were recorded and eight songs from the show of September 30 appear on their box set Live 1975–85  The September 27 show was released through Springsteen's website in 2019 
U2 played at the stadium during leg three of their breakout Joshua Tree tour on November 17 and 18, 1987  They later returned to the stadium for their PopMart Tour on June 21, 1997 
Los Angeles natives Mötley Crüe played at the stadium on December 13, 1987, during the second leg of their Girls, Girls, Girls World Tour, with fellow Los Angeles band Guns N' Roses as the opening act  At that time, Mötley Crüe was one of the most popular and successful acts in the world, while Guns N' Roses was one of the largest up-and-coming acts  The latter would later return for four shows in October 1989 as the opening act for the Rolling Stones, then again on September 27, 1992, as part of their infamous co-headlining tour with Metallica 
The stadium played host to The Monsters of Rock Festival Tour, featuring Van Halen, Scorpions, Dokken, Metallica, and Kingdom Come, on July 24, 1988  A second show was planned to take place on July 23, but was later canceled 
The stadium also played host to Amnesty International's Human Rights Now! Benefit Concert on September 21, 1988, headlined by Sting and Peter Gabriel and also featuring Bruce Springsteen and the E Street Band, Tracy Chapman, Youssou N'Dour, and Joan Baez 

1990s–2000s
The Raiders began looking to move out of the Coliseum as early as 1986  In addition to the delays in renovating the stadium, they never drew well; even after they won Super Bowl XVIII in 1984, they had trouble filling it  The NFL scheduled all of the Raiders' appearances on Monday Night Football as road games since the Los Angeles market would have been blacked out due to the Coliseum not being sold out  Finally, in 1995, the Raiders left Los Angeles and returned to Oakland, leaving the Coliseum without a professional football tenant for the first time since the close of World War II 
In the mid-1990s, the Coliseum was planned to be the home of the Los Angeles Blaze, a charter franchise of the United League (UL) which was planned to be a third league of Major League Baseball 
The Legends Football League began as a halftime spectacular known as the Lingerie Bowl  The first three years (2004, 2005, 2006) were played at the Coliseum  From 2009 to 2011, a couple of Los Angeles Temptation games were played in the Coliseum  Beginning in 2015, the Temptation resumed playing at the Coliseum after three seasons at Citizens Business Bank Arena in Ontario 
The 1991 CONCACAF Gold Cup soccer tournament was also held at the Coliseum  The United States national team beat Honduras in the final  The Coliseum also staged the final match of the Gold Cup in 1996, 1998 and 2000  In October 2000, the United States played its last match at the stadium in a friendly versus Mexico  Since then, the team has preferred the Rose Bowl Stadium and Dignity Health Sports Park as home stadiums in Greater Los Angeles 
The stadium hosted the K-1 Dynamite!! USA mixed martial arts event  The promoters claimed that 54,000 people attended the event, which would have set a new attendance record for a mixed martial arts event in the United States; however, other officials estimated the crowd between 20,000 and 30,000 In May 1959, the Dodgers had hosted an exhibition game against the reigning World Series champion New York Yankees at the Coliseum, a game which drew over 93,000 people  The Yankees won that game 6–2  As part of their West Coast 50th anniversary celebration in 2008, the Dodgers again hosted an exhibition game against the reigning World Series champions, the Boston Red Sox  On March 29, 2008, the middle game of a three-game set in Los Angeles was also won by the visitors by the relatively low score of 7–4, given the layout of the field; Red Sox catcher Jason Varitek had joked that he expected scores in the 80s 
As previously mentioned in the 1950s–1960s section, during 1958–1961, the distance from home plate to the left field foul pole was 251 feet (76 5 m) with a 42-foot (13 m) screen running across the close part of left field  Due to the intervening addition of another section of seating rimming the field, the 2008 grounds crew had much less space to work with, and the result was a left field foul line only 201 ft  long (61 3 m), with a 60-foot (18 m) screen, which one Boston writer dubbed the "Screen Monster"  Even at that distance, 201 feet (61 m) is also 49 ft (14 9 m) short of the minimum legal home-run distance  This being an exhibition game, balls hit over the 60 ft (18 m) temporary screen were still counted as home runs  There were only a couple of home runs over the screen, as pitchers adjusted (and Manny Ramirez did not play) 
A diagram () illustrated the differences in the dimensions between 1959 and 2008:

2008 – LF 201 ft (61 3 m) – LCF 280 ft (85 3 m) – CF 380 ft (115 8 m) – RCF 352 ft (107 3 m) – RF 300 ft (91 4 m)
1959 – LF 251 ft (76 5 m) – LCF 320 ft (97 5 m) – CF 417 ft (127 1 m) – RCF 375 ft (114 3 m) – RF 300 ft (91 4 m)A sellout crowd of 115,300 was announced, which set a Guinness World Record for attendance at a baseball game, breaking the record set at a 1956 Summer Olympics baseball demonstration game between teams from the US and Australia at the Melbourne Cricket Ground 
The Coliseum formerly hosted the major U S  electronic dance music festival, the Electric Daisy Carnival  It last hosted the event in 2010; following the drug-related death of an underage attendee at EDC that year, the festival's organizer Insomniac Events was blacklisted from hosting future events at the venue, and it subsequently moved to Las Vegas Motor Speedway in 2011 In 2003, select events of the X Games IX action sports event were held at the Coliseum  In 2010, the X Games XVI were held at the venue In 2006, the Coliseum Commission focused on signing a long-term lease with USC, who offered to purchase the facility from the state but was turned down  After some at-time contentious negotiations, with the university threatening to move to the Rose Bowl in late 2007, the two sides signed a 25-year lease in May 2008, giving the Coliseum Commission 8% of USC's ticket sales, approximately $1 5 million a year, but committing the agency to a list of renovations In 2006, Mexican band RBD held a concert during their U S  tour before 70,000 people, with tickets sold out in less than 30 minutes  It was the highest attended event by a Mexican act since Los Bukis' 1993 and 1996 concerts On June 23, 2008, the Los Angeles Memorial Coliseum Commission announced that they were putting the naming rights of the Coliseum on the market, predicting a deal valued at $6 million to $8 million a year  The funds would go towards financing over $100 million in renovations over the next decade, including a new video board, bathrooms, concession areas, and locker rooms  Additional seating was included in the renovation plans which increased the Coliseum's seating capacity to 93,607 in September 2008 

On June 17, 2009, the Coliseum was the terminus for the Los Angeles Lakers' 2009 NBA championship victory parade  A crowd of over 90,000 attended the festivities, in addition to the throngs of supporters who lined the 2-mile (3 2 km) parade route  The Coliseum peristyle was redesigned in purple and gold regalia to commemorate the team, and the Lakers' court was transported from Staples Center to the Coliseum field to act as the stage  Past parades had ended at Staples Center, but due to the newly constructed L A  Live complex, space was limited around the arena 

2010s–present
On July 30, 2011, the LA Rising festival with Rage Against the Machine, Muse, Rise Against, Lauryn Hill, Immortal Technique, and El Gran Silencio was hosted at the Coliseum 
Roger Waters continued his The Wall Live at the stadium on 19 May 2012 to a sold-out crowd 
On April 27, 2013, the stadium hosted a round of the Stadium Super Trucks off-road race 
On September 13, 2014, the Coliseum hosted the fifth-place game, third-place game and final of the 2014 Copa Centroamericana in front of 41,969 spectators 
In August 2015, the Coliseum hosted the opening and closing ceremonies for the 2015 Special Olympics World Summer Games On June 16, 2018, Shannon Briggs hosted the first press conference for a celebrity boxing event with KSI, Deji, Jake Paul, and Logan Paul On September 14, 2021, the NASCAR Cup Series announced that the annual Busch Clash would take place at the Coliseum, at a purpose-made quarter-mile track On December 9, 2021, Kanye West performed a benefit concert for the long-imprisoned Larry Hoover with special guest Drake at the Coliseum 
On September 23 and 24, 2022 German band Rammstein performed two shows as part of the North American leg of their Rammstein Stadium Tour
On December 10, 2022, Deadmau5 and Kaskade performed as their collaborative project Kx5 to a crowd of 50,000  Making it the largest ever one-day EDM headlining event in North America at the time 

Return of the Los Angeles Rams 2016-19
On January 12, 2016, the NFL gave permission for the St  Louis Rams to relocate back to Los Angeles  The Rams resumed play at the Coliseum while awaiting completion of SoFi Stadium in Inglewood On August 13, 2016, the Coliseum hosted its first NFL game at the stadium since 1994, as the Rams hosted Dallas Cowboys at a preseason game in front of 89,140 people  On September 18, 2016, the Coliseum hosted the first Rams regular season home game since 1979, against the Seattle Seahawks following an impromptu pregame concert from the Red Hot Chili Peppers  The Rams would boast a 9–3 victory over Seattle in front of a crowd of 91,046 in attendance 

On January 6, 2018, the Coliseum hosted its first Rams playoff game since the 1978 NFC Championship game, a 26-13 wild card round loss to the defending NFC champion Atlanta Falcons 
On November 19, 2018, the Coliseum hosted its first Monday Night Football game since 1985, and the first Monday night game the Rams hosted at the Coliseum, exact date 40 years later, with the Rams taking on the Kansas City Chiefs  That game, which was originally scheduled to be played at Estadio Azteca in Mexico City that night, was moved to the Coliseum due to poor field conditions at the former   The Rams won the game, 54–51 in the highest-scoring game in Monday Night Football history 
On January 12, 2019, the Coliseum hosted its final NFL playoff game, where the Rams defeated the Dallas Cowboys 30-22 in an NFC Divisional Playoff 
On December 8, 2019, the final Sunday Night Football game would be played at the Coliseum in which the Rams defeated the rival Seattle Seahawks 28-12 in front of a crowd of over 77,000 people 
On December 29, 2019, the Rams played their final game at the Coliseum, beating the Arizona Cardinals 31-24 before moving to SoFi Stadium in time for the 2020 NFL season  The Rams finished with a record of 16-14 playing their home games at the Coliseum in their second stint as tenants from 2016 through 2019 
On February 16, 2022, three days after winning Super Bowl LVI, the Rams hosted their victory celebration before thousands of fans in front of the Coliseum's peristyle end 

2028 Summer Olympics
Los Angeles will host the Summer Olympics in 2028  During the 131st IOC Session, the International Olympic Committee officially awarded the 2028 Summer Olympics to Los Angeles on July 31, 2017  The Coliseum will be the first stadium to host events for three different Olympic games 

NASCAR
On February 6, 2022, NASCAR hosted a pre-season NASCAR Cup Series exhibition event  The temporary quarter-mile track marked the series' first race of any kind on a quarter-mile since 1971 and was won by Joey Logano  Martin Truex Jr won the 2023 running of the event 

Seating and attendance
Seating capacity (college football)
Source:Ballparks com

Attendance records
1963 Billy Graham Crusade
The largest gathering in the Coliseum's history was a Billy Graham crusade which took place on September 8, 1963, with 134,254 in attendance, noted by the Coliseum's website as an all-time record  With the renovations of 1964, the capacity of the Coliseum was reduced to roughly 93,000 for future events 

Sporting events
College footballRecords differ between the 2006 USC football media guide and 2006 UCLA football media guide  (This may be due to only keeping records for "home" games until the 1950s ) The USC Media guide lists the top five record crowds as:

1  104,953 — vs  Notre Dame 1947 (USC home game; Highest attendance for a football game in the Coliseum)
2  103,303 — vs  UCLA 1939 (USC home game)
3  103,000 — vs  USC 1945 (UCLA home game)
4  102,548 — vs  USC 1954 (UCLA home game)
5  102,050 — vs  UCLA 1947 (USC home game)The UCLA Media guide does not list the 1939 game against USC, and only lists attendance for the second game in 1945 for Coliseum attendance records  These are the top three listed UCLA record Coliseum crowds:

1  102,548 — vs  USC 1954 (UCLA home game)
2  102,050 — vs  USC 1947 (UCLA home game)
3  100,333 — vs  USC 1945 (USC home game; 1945's second of two meetings)The largest crowd to attend a USC football game against an opponent other than UCLA or Notre Dame was 96,130 for a November 10, 1951, contest
with Stanford University  The largest attendance for a UCLA contest against a school other than USC was 92,962 for the November 1, 1946, game with Saint Mary's College of California 

National Football LeagueThe Los Angeles Rams played the San Francisco 49ers before an NFL record attendance of 102,368 on November 10, 1957   This was a record paid attendance that stood until September 2009 at Cowboys Stadium, though the overall NFL regular season record was broken in a 2005 regular season game between the Arizona Cardinals and San Francisco 49ers at Azteca Stadium in Mexico City  Both records were broken on September 20, 2009, at the first regular season game at Cowboys Stadium in Arlington, Texas, between the Dallas Cowboys and New York Giants 
In 1958 the Rams averaged 83,680 for their six home games, including 100,470 for the Chicago Bears and 100,202 for the Baltimore Colts 
In their 13 seasons in Los Angeles the Raiders on several occasions drew near-capacity crowds to the Coliseum   The largest were 91,505 for an October 25, 1992, game with the Dallas Cowboys, 91,494 for a September 29, 1991, contest with the San Francisco 49ers, and 90,380 on January 1, 1984, for a playoff game with the Pittsburgh Steelers 
The Coliseum hosted the first AFL-NFL World Championship Game, later called the Super Bowl  The January 15, 1967, game, pitting the Green Bay Packers against the Kansas City Chiefs, attracted 61,946 fans—a lower-than anticipated crowd (by comparison, a regular-season game between the Packers and Rams a month earlier drew 72,418)  For Super Bowl VII in 1973, which matched the Miami Dolphins against the Washington Redskins, the attendance was a near-capacity 90,182, a record that would stand until Super Bowl XI at the Rose Bowl  The 1975 NFC Championship Game between the Los Angeles Rams and Dallas Cowboys had an attendance of 88,919, still the largest crowd for a conference championship game since the conference-title format began with the 1970 season   The 1983 AFC Championship Game between the Raiders and Seattle Seahawks attracted 88,734 
The Rams'  first NFL game at the Coliseum since 1979,  after spending fifteen years at Anaheim Stadium and then twenty-one seasons in St  Louis, a pre-season contest against the Cowboys on August 13, 2016, drew a crowd of 89,140  The team's first regular-season home game, on September 18 against the Seattle Seahawks, attracted 91,046—the largest attendance for a Rams game at the Coliseum since 1959 

Major League BaseballContemporary baseball guides listed the theoretical baseball seating capacity as 92,500  Thousands of east-end seats were very far from home plate, and were not sold unless needed  The largest regular season attendance was 78,672, the Dodgers' home debut in the Coliseum, against the San Francisco Giants on April 18, 1958 
The May 7, 1959, exhibition game between the Los Angeles Dodgers and the 1958 World Series Champion New York Yankees, in honor of disabled former Dodgers catcher Roy Campanella, drew 93,103, which was a Major League Baseball record prior to 2008 
All three Dodgers home games in the 1959 World Series with the Chicago White Sox exceeded 90,000 attendance  Game 5 drew 92,706 fans, a major league record for a non-exhibition game 
The attendance for the exhibition game on March 29, 2008, between the Boston Red Sox and the Los Angeles Dodgers, was 115,300, setting a new Guinness World Record for attendance at a baseball game  The previous record of an estimated 114,000 was in the 1956 Summer Olympics at Melbourne Cricket Ground for an exhibition game between teams from branches of American Military Forces and Australia 

SoccerThe first official soccer match at the Coliseum was an international fixture between the United States and Mexico that took place on March 7, 1965, as part of regional World Cup qualification  The teams drew 2–2 in front of 22,570 spectators Although the stadium represents the second most active venue in the history of the US national team (after Robert F  Kennedy), it has only played 22 matches in it, the last of them in 2000  Of these, eleven were of official competition (three from World Cup qualifiers, seven from the CONCACAF Gold Cup and one from the North American Nations Cup) and eleven friendlies, all category "A"  In this scenario, the team won their first absolute title by finishing as champion of the 1991 CONCACAF Gold Cup, defeating their counterpart from Honduras on penalties However, the most active national team at the Memorial Coliseum is Mexico, which has played 86 matches in the building: 14 in official competition (3 in the World Cup qualifying round, 9 in the Gold Cup and two from the North American Nations Cup), including the Gold Cup finals from 1996 and 1998, in which they won 2-0 against Brasil and 1-0 against United States respectively; and 72 friendlies (50 of Category "A" - against other senior teams -, 6 of the so-called "B" selection and 16 against both Mexican and foreign clubs  Los Angeles is the second stadium where the Mexican representative has played the most matches, only after its official headquarters, the Azteca Stadium, surpassing any other venue both in his country and in the United States The stadium hosted the Los Angeles Wolves during the inaugural season of the United Soccer Association in 1967, which culminated in the final championship at the Coliseum  The Los Angeles Toros of the National Professional Soccer League also played at the Coliseum in 1967, but were moved to San Diego the following season before folding  The Los Angeles Aztecs of the North American Soccer League played at the Coliseum in 1977 and 1981 between stints at the Rose Bowl 

Sculpture and commemorations
A pair of life-sized bronze nude statues of male and female athletes atop a 20,000 pound (9,000 kg) post-and-lintel frame formed the Olympic Gateway created by Robert Graham for the 1984 games  The statues, modeled on water polo player Terry Schroeder and long jumper from Guyana, Jennifer Inniss, who participated in the games, were noted for their anatomical accuracy  A decorative facade bearing the Olympic rings was erected in front of the peristyle for the 1984 games, and the structure remained in place through that year's football season   The stadium rim and tunnels were repainted in alternating pastel colors that were part of architect Jon Jerde's graphic design for the games; these colors remained until 1987 

"Court of Honor" plaques
"Commemorating outstanding persons or events, athletic or otherwise, that have had a definite impact upon the history, glory, and growth of the Los Angeles Memorial Coliseum"

Coliseum Cauldron
The Coliseum Cauldron  was built for the 1932 Summer Olympics and was also reused during the 1984 Summer Olympics 
The cauldron is a main sight on stadium and is still present in the Stadium and is lit during special events (such as the period when an edition of the Olympic Games are being held in another city or in mourning for some personality related to the city)  As the stadium was the main venue on the 2015 Special Olympics World Summer Games the cauldron was relit by Rafer Johnson during the opening ceremonies and being extinguished again during the closing ceremony 
In addition, the torch has been lit on the following historic occasions:

To honor the memory of Israeli athletes killed during the terrorist attack during the 1972 Summer Olympics in Munich 
For several days following the Space Shuttle Challenger disaster in 1986 
For over a week following the September 11 attacks in 2001 
The pyre was lit for a week without interruption during the official period of mourning after the death of the former American president Ronald Reagan  Reagan was the president of the United States when the city of Los Angeles hosted the 1984 Summer Olympics and also declared that edition of the Games open, and was also Governor of California from 1967-75 
In April 2005 following the death of Pope John Paul II, who had celebrated Mass at the Coliseum during his visit to Los Angeles in 1987 
At the Los Angeles Dodgers' 50th anniversary game on March 29, 2008, during the ThinkCure! charity ceremony (while Neil Diamond's "Heartlight" was played and the majority of the attendees turned on their complimentary souvenir keychain flashlights) 
For the returning Los Angeles Rams' first home game on September 18, 2016, against the Seattle Seahawks 
On the evening of September 13, 2017, when Los Angeles was awaiting a few hours before the confirmation as the host city of the 2028 Summer Olympics 
For the Coliseum Gladiator MMA Championship Finals on Sat  September 23, 2017 
For the Los Angeles Rams' first playoff game in Los Angeles in 38 years on January 6, 2018, against the Atlanta Falcons 
To honor the victims of the 2018 California wildfires & the Thousand Oaks shooting 
For the Los Angeles Rams' final regular season game against the San Francisco 49ers on December 30, 2018 
For the Los Angeles Rams' playoff game against the Dallas Cowboys on January 12, 2019 
For the Rams' final game in the Coliseum vs  the Arizona Cardinals on December 29, 2019 
To honor Kobe Bryant after his death on January 26, 2020 
To honor Rafer Johnson after his death on December 2, 2020 
To honor Former L A  Councilman Tom LaBonge, known to many as "Mr  Los Angeles" after his death on January 14, 2021 
To honor Dodgers Legend Tommy Lasorda after his death on January 14, 2021 
For the Kanye West and Drake Larry Hoover Benefit Concert on December 9, 2021 
For the 2022 NASCAR Busch Light Clash at the Coliseum on February 6, 2022  The Cauldron was ceremoniously lit by 4 time NASCAR Champion Jeff Gordon 
To honor Mexican singer Vicente Fernandez on February 17, 2022, after his death and on the anniversary of his birthday  "Chente" was arguably the greatest Latin artist to perform at the LA Memorial Sports Arena appearing countless times over at least three decades (70s, 80s, and 90s) 
For the 2023 NASCAR Busch Light Clash at the Coliseum   The Cauldron was lit by 2022 Heisman Trophy winner Caleb Williams 

In popular culture
Film
1923: Scenes from the Roman Age in Buster Keaton's Three Ages were filmed in the Coliseum, the first ever use of the Coliseum as a movie location 
1927: Scenes in College a 1927 comedy-drama silent film directed by James W  Horne and Buster Keaton, and starring Keaton, Anne Cornwall, and Harold Goodwin are filmed on the field of the Coliseum 
1944: Scenes in “The Falcon in Hollywood” starring Tom Conway 
1972: The Coliseum was used in the filming of Hickey & Boggs  There is a gunfight that takes place within the stadium 
1976: The Coliseum was the key location in the movie Two-Minute Warning 
1978: The Coliseum was used in the filming of Warren Beatty's film Heaven Can Wait, about a fictional Super Bowl XII game between the Pittsburgh Steelers and the Los Angeles Rams 
1994: The outside of the Coliseum was used as a scene in D2: The Mighty Ducks 
1996: The Coliseum was used in the filming of Escape from L A  starring Kurt Russell, including a basketball death match 
1997: The Coliseum was used in the filming of Money Talks starring Chris Tucker and Charlie Sheen 
2002: The field and locker room were used in the filming of the pornographic Gangbang Girl #32 starring Kimberly Franklin, Olivia Saint and Gauge
2013: The stadium appears in one of the final scenes of World War Z when the military bombs the stadium full of zombies 

Television and streaming
1972: The Coliseum was a key location in "The Most Crucial Game", the third episode of the second season of Columbo 
1976: The Coliseum was used in filming of Emergency! (1970's TV Series) episode titled "The Game" 
1978: The Coliseum was used in the filming of The Incredible Hulk episode titled "Killer Instinct" 
1978: The Coliseum was used in the filming of the Charlie's Angels episode titled "Pom Pom Angels" 
2003: The Coliseum was used in the filming of the last episode of the second season of the television series 24 
2008: The Coliseum was used as the starting point of the premiere episode of The Amazing Race 13 
2009: The Coliseum was featured in Life After People  150 years after people, an earthquake brings down the Coliseum 
2016: The Coliseum was used as the finishing point for the second episode of the Chinese reality show Race the World 
2019: Season 17 of Bravo's Top Chef filmed an episode at the Coliseum at the 1923 Club on the roof of the new Scholarship Club Tower 
Visiting    with Huell Howser Episode 411, which includes an interview of Robert Graham
2021: The Coliseum was used in the filming of the last episode of the fifth season of the Netflix series Lucifer 

Video games
1996: Microsoft Flight Simulator for Windows 95 included a challenge to fly through the needle of the Coliseum and land on the field  
2004/2013: The Maze Bank Arena featured in Grand Theft Auto San Andreas and Grand Theft Auto V has an outer wall and arch similar to the Coliseum, but has a roof 
2005: The Coliseum is featured as one of the playable Supercross tracks in MX vs  ATV Unleashed
2008: The Coliseum was featured in Midnight Club: Los Angeles, albeit with a different name 
2011: The Coliseum featured as a rallycross track in Dirt 3 
2014: The Coliseum is one of the main settlements of Los Angeles in Wasteland 2
2019: The Coliseum is featured as one of the playable Supercross tracks in Monster Energy Supercross 2: The Official Video Game as a DLC 

See also
BMO Stadium
List of NCAA Division I FBS football stadiums
History of the National Football League in Los AngelesPeople

A J  Barnes, active in fight against giving USC preferential rights in the Coliseum, 1932
Lloyd G  Davies, Los Angeles City Council member, 1943–51, urged that the city take over full management of the Coliseum
Harold A  Henry, Los Angeles City Council president and later a member of the Coliseum Commission
Rosalind Wiener Wyman, first representative of the Los Angeles City Council on the Coliseum Commission, 1958
Ransom M  Callicott, Los Angeles City Council, commission member, 1962
Passage 3:
1995 Pro Bowl
The 1995 Pro Bowl was the NFL's all-star game for the 1994 season  The game was played on February 5, 1995, at Aloha Stadium in Honolulu, Hawaii  The final Score was AFC 41, NFC 13  This was the AFC's largest margin of victory since the AFL-NFL merger  Rookie Marshall Faulk of the Indianapolis Colts rushed for a Pro Bowl record 180 yards and was the game's MVP  Chris Warren of the Seattle Seahawks added 127 yards rushing as the AFC posted records for rushing yards (400) and total yards (552)  Both Warren and Faulk broke the Pro Bowl rushing record, formerly held by O  J  Simpson The coaches were Dallas’ Barry Switzer and Bill Cowher of the Pittsburgh Steelers  The game was viewed by 49,121 at Aloha Stadium  The referee was Larry Nemmers 

Rosters
Passage 4:
Merlin Olsen
Merlin Jay Olsen (; September 15, 1940 – March 11, 2010) was an American football player, announcer, and actor  For his entire 15-year professional football career he was a defensive tackle with the Los Angeles Rams in the National Football League (NFL)   He was selected to play in the Pro Bowl 14 times — every year but his last  The only other football players to have matched or exceeded that number are the former offensive lineman Bruce Matthews, the former tight end Tony Gonzalez, the former quarterback Peyton Manning, and the former quarterback Tom Brady, who is the only NFL player to have played more times in the Pro Bowl, with 15 selections 
In 1961, Olsen received the Outland Trophy, awarded to as the best lineman of the year in college football  He is a member of the Pro Football Hall of Fame and the College Football Hall of Fame  As an actor, he portrayed a farmer, Jonathan Garvey, on Little House on the Prairie  After leaving that series, he starred in his own NBC drama, Father Murphy 

Early life
Merlin Olsen was born in Logan, Utah, where his parents Merle Barrus and Lynn Jay Olsen graduated from Utah State University (USU) and began their careers  His father was a professor at the university while his mother had graduated in elementary education  Merlin was the second of nine siblings and the first-born son  The family opened their home to host, feed, sleep or tutor anyone in the neighborhood; during the winter, Merle would lay wood over the entrance of the house so that ice skaters from the local park could walk in 
Merlin pursued athletics in high school but was cut from the basketball team while in grade 9, told by the coach that athletics wasn't for him and that he should take up the arts  Later, Olsen turned down a football scholarship to Stanford University to play for USU  Classmate Ross Peterson described him as a "natural, big, strong leader     he could have been successful at anything"  His brothers Phil and Orrin also played football 

Education
Olsen attended Utah State University where he became a member of the Sigma Chi fraternity, and was a three-year letterman in football as a defensive tackle  He graduated from the College of Business and Social Sciences at USU with a bachelor's degree in finance in 1962 and a master's degree in economics in 1971  He later received an honorary doctorate degree in business from the Huntsman School In football, as a senior, he was a consensus All-American selection and was the winner of the Outland Trophy  After Olsen's junior year of 1960 he was also named All-American by the Football Writers Association of America and Newspaper Enterprise Association  He was also All-Conference in both 1960 and 1961  Olsen and Utah State were in the 1960 Sun Bowl, losing to New Mexico State, 20–13  Led by Olsen, the Aggie defense held the New Mexico State Aggies to just 44 rushing yards on 32 carries The Aggie defense Olsen anchored as a senior gave up an average of 50 8 rushing yards (which led the nation), 88 6 passing yards, and 139 4 total yards which all still stand as school records for defense  The 1961 Aggie defense gave up an average 7 8 points a game, which is second in team history behind Olsen's 1960 team, which allowed 6 5 points per game  Additionally, the Aggie defense held four opponents to less than 100 total yards  One, the University of Idaho, was held to a school-record 23 total yards, with the Aggies winning 69–0 
The Aggies, not known as a national power football program, finished 10th in both the AP and UPI post-season polls, the only time that has occurred in school history  The Aggies had a combined 18–3–1 record during Olsen's junior and senior seasons under coach John Ralston and were conference champions those two seasons as well He was a member of the Utah State University chapter of the Sigma Chi fraternity, which has an annual Merlin Olsen Day of Service named in his honor where brothers are encouraged to give back to their communities 

Awards and honors
Olsen played in the East-West Shrine Game in 1961 and in 2003 was voted to the game's Hall of Fame  He also played in the Hula Bowl after his senior season and was voted MVP of the game Olsen is a member of the State of Utah's Sports Hall of Fame, the Utah State University Sports Hall of Fame and USU's All-Century Football Team  In 2000, he was selected by Sports Illustrated as one of the State of Utah's Top 50 Athletes of the Century  He was voted to the All-Academic All-America Hall of Fame in 1988  In 1969, he was voted to the Newspaper Enterprise Association All-Time All-America team with collegiate greats such as Bronko Nagurski, Red Grange, Jim Thorpe, and O  J  Simpson, among others In 2008, Olsen was named to the 75th Anniversary All-Sun Bowl Team to commemorate the Sun Bowl Association's Diamond Anniversary Utah State University announced the intention to name its football field after Olsen during a ceremony in Logan during halftime of the USU-St  Mary's basketball game on December 5, 2009 Olsen also was a three-time academic All-American at Utah State and graduated summa cum laude in 1962 with a degree in finance 

Career
Professional football
Coming out of college, Olsen had offers from both the Los Angeles Rams of the National Football League and the Denver Broncos of the rival American Football League  He chose the security of the NFL and signed with the Rams  Olsen's first contract was for around $50,000 for two years, plus a signing bonus  It was 1962, and the average football player salary at the time was around $12,000 a year  He was the first USU Aggie to be drafted in the 1st round of the NFL draft Olsen played professionally (1962–1976) for the Los Angeles Rams of the National Football League   A leading defensive star of his era, he missed only two games in his 15-season NFL career  He was named the NFL's Rookie of the Year in 1962 and was First-team All-Pro in 1964, and 1966 through 1970  He was voted Second-team All-Pro in 1965, 1973 and 1974 Olsen almost ended up on offense, but was later moved to the defensive line after a few experiments in practice  Soon he became part of one of the best front fours in NFL history  Deacon Jones, Rosey Grier, and Lamar Lundy joined Olsen on the defensive line in 1963 that was nicknamed "The Fearsome Foursome"  He was named the AP NFL Defensive Player of the Week for week 12 in 1965  Olsen scored his first touchdown in that game 
Throughout the 1960s, this quartet terrorized opposing offenses  Olsen's play helped the Rams to the playoffs in 1967 and 1969  He was voted the club's Outstanding Defensive Lineman from 1967 to 1970 by the Los Angeles Rams Alumni  In week 14, 1967, Olsen and the rest of the Fearsome Foursome were named the AP NFL Defensive Players of the Week for their performance against the Baltimore Colts  In the 1970s, Olsen continued his dominant play at defensive tackle and his 11 sacks in 1972 were second on the team  After week 8 in 1972, Olsen was named the Associated Press NFL Defensive Player of the Week for the third time in his career The Rams won the NFC West crown in 1973 through 1976 thanks in part to the play of Olsen  They ranked first in the NFL in run defense in 1973 and 1974 and finished second in sacking opposing passers both years  In 1973 Olsen was voted the NFLPA NFC Defensive Lineman of the Year and the next season, 1974, he was the recipient of Bert Bell Award as the NFL MVP as voted by the Maxwell Club  Olsen accepted the award "on behalf of all who toil in the NFL trenches" 
Three of the Olsen brothers, Merlin, Phil, and Orrin, played in the NFL, with Merlin and Phil playing together for the Rams from 1971 to 1974  A nephew, Hans, son of his brother, Clark, also played professional football  In 1975 and 1976, the Rams defense finished second in the NFL against the run while ranking in the top five in sacking opposing quarterbacks and compiling a 22-5-1 record over those two seasons 
Olsen's last game was the NFC Championship game in 1976 at Bloomington, Minnesota  The Vikings took advantage on a freak play early in the game  A blocked field goal returned 90 yards for a touchdown shocked the Rams in the first quarter  The defense was later victimized by a couple of big plays by the Vikings  The Rams came up short, losing 24–13, bringing the storied career of the Rams' finest defensive tackle to an end 
Olsen made the Pro Bowl a then-record 14 times, missing it only in his final year  He was inducted into the Pro Football Hall of Fame in 1982 in his first year of eligibility; he selected his college position coach Tony Knap as his presenter  In 1999, Olsen was ranked 25th on The Sporting News' list of the 100 Greatest Football Players 

Entertainment
Olsen enjoyed continued success after the NFL as a broadcaster, actor, and businessman Olsen served as a television color commentator, teaming mostly with Dick Enberg on NBC's coverage of the AFC during the late 1970s and almost all of the 1980s  He and Enberg also teamed for four Super Bowls (XV, XVII, XX and XXIII), as well as nine Rose Bowls from 1980 to 1988  Olsen also worked Super Bowl XIII in 1979 with Curt Gowdy and John Brodie (Enberg was then serving as pre-game/halftime/post-game host)  In 1989, Olsen was replaced by Bill Walsh as NBC's lead NFL color commentator  For the 1989 season, Olsen worked with Charlie Jones on NBC's broadcasts  In 1990 and 1991, he moved to CBS Sports doing NFL games with Dick Stockton 
Olsen developed a successful career as an actor  He appeared as the character Little George in the John Wayne movie, The Undefeated, with Rams teammate Roman Gabriel, in 1969 
In 1970, he appeared once on Petticoat Junction, in the episode: "With This Ring"   He played mountaineer Merlin Fergus 
When Little House on the Prairie actor Victor French left to star in his own comedy Carter Country in 1977, Olsen was tapped to play Michael Landon's new sidekick Jonathan Garvey for several years  One memorable quote from his character's son, Andy Garvey, "My pa doesn't know anything about football!" came when Andy's friends suggested that Jonathan coach their football team 
Olsen played the starring role of John Michael Murphy in the 1981-83 NBC television drama series Father Murphy 
In the Highway to Heaven episode 2 12 ("The Good Doctor"), the main character, Alex, tells Mark Gordon (Victor French) that "All I could see was the flowers and the beard   I thought you were Merlin Olsen " This is an inside joke since all three actors, Merlin Olsen, Michael Landon, and Victor French were in the TV series Little House On the Prairie  earlier in their careers 
Olsen's last acting work was in the short-lived 1988 TV series Aaron's Way 
Olsen was also the commercial spokesman for FTD Florists for many years  A part-time resident of the Coachella Valley, Olsen was the longtime radio and television spokesman for Palm Desert-based El Paseo Bank Olsen also appeared in many Sigma Chi fraternity promotional campaigns; Merlin, along with his brother Phil, was a Life Loyal Sig, Significant Sig (given to members for distinguishing acts outside the fraternity) and a member of the Order of Constantine (given for service to the Fraternity)  Olsen donated one of his cleats, which were bronzed, to be used during the annual football rivalry between two Las Vegas high schools, Eldorado High School and Chaparral High School, which both opened in 1973  Each year, Olsen presented the "trophy" in the ceremony at the rivalry game Olsen often co-hosted the Children's Miracle Network telethons, a humanitarian organization founded in 1983 by Marie Osmond and John Schneider 

Awards
He was named the Walter Camp Man of the Year in 1982 and Athlete of the Century for the state of Utah  During halftime of a basketball game between Utah State, Olsen's alma mater, and Saint Mary's on December 5, 2009, Utah State University announced that the playing surface inside Romney Stadium, home stadium for the university's football program, would be named Merlin Olsen Field in Olsen's honor  Because of Olsen's illness, Utah State decided not to wait until the 2010 football season to hold the ceremony; he was able to attend the game, but did not speak  A sculpture of Olsen was unveiled in a plaza south of the stadium during an official dedication ceremony in Fall 2010 In 1979, Olsen was inducted into the Utah Sports Hall of Fame In 1980, Olsen was inducted into the National College Football Hall of Fame In 1998, Olsen was inducted into the Utah Tourism Hall of Fame Olsen was voted to the California Sports Hall of Fame Class of 2010, along with Bill Walton, Dwight Stones, and Jim Otto, among others In 1983, Olsen served as Grand Marshal of the Rose Parade 

Personal life
On March 30, 1962, Olsen married Susan Wakley, a fellow USU student  They had three children: Kelly, Jill, and Nathan  
Olsen was a member of the Church of Jesus Christ of Latter-day Saints, and a resident of San Marino, California Olsen was diagnosed with peritoneal mesothelioma in 2009, and underwent three courses of chemotherapy  In December 2009, he filed a lawsuit against 25 defendants including NBC Studios, NBC Universal, 20th Century Fox, Georgia Pacific, Sherwin-Williams, and Lennox Corp  for allegedly exposing him to the asbestos which he claimed had caused his cancer Olsen died on March 11, 2010, at City of Hope National Medical Center in Duarte, California, at the age of 69 Olsen is buried at San Gabriel Cemetery in San Gabriel, California 

Filmography
Film
Television
Context 2: Passage 1:
Gary L  Bennett
Gary L  Bennett (born January 17, 1940) is an American scientist and engineer, specializing in aerospace and energy   He has worked for NASA and the US Department of Energy (DOE) on advanced space power systems and advanced space propulsion systems   His professional career has included work on the Voyager, Galileo, and Ulysses space missions, and is currently working as a consultant in aerospace power and propulsion systems  He is also a science fiction author (The Star Sailors) 

Biography
Bennett was born in Twin Falls, Idaho  He joined the NASA headquarters in June 1988 as the Manager of Advanced Space Power Systems in the transportation division of the Office of Advanced Concepts and Technology  There, he managed a number of transportation technology programs including hybrid propulsion, electric propulsion, low-thrust chemical propulsion, and other advanced propulsion concepts (e g , fusion, antimatter)  He was also the first program manager of the advanced technology insertion program for the Pluto Fast Flyby (now New Horizons) mission and the TIMED space physics mission 
Prior to coming to NASA, Bennett held key positions in DoE's space radioisotope power program, including serving as Director of Safety and Nuclear Operations for the radioisotope power sources that were used on the Galileo mission to Jupiter and that are being used on the Ulysses mission to explore the polar regions of the Sun   This same radioisotope power source design was then flown on the Cassini mission to Saturn and on the New Horizons mission to Jupiter 
Previous positions included Chief of the Research Support Branch in the US Nuclear Regulatory Commission (NRC) where Bennett was instrumental in creating and managing NRC's reactor operational safety research program 
Bennett was the flight safety manager for the radioisotope power sources currently in use on the Voyager 1 and Voyager 2 spacecraft (which went to Jupiter, Saturn, Uranus, Neptune and beyond) and on Lincoln Laboratory's LES 8 and LES 9 communications satellites 
Bennett also worked as a physicist in the NERVA (Nuclear Engine for Rocket Vehicle Applications) program at what was then NASA's Lewis Research Center (now the John H  Glenn Research Center) in Cleveland, Ohio   He did fundamental reactor safety research at what is now the Department of Energy's Idaho National Laboratory (INL) 
From 1980 to 1988, he was a member of or adviser to US delegations to the two subcommittees of the United Nations Committee on the Peaceful Uses of Outer Space and he prepared the official US position papers on the use of nuclear power sources in outer space 
From 1988 to 1990, Bennett chaired the Steering Group of the Interagency Advanced Power Group (IAPG), the national coordinating group for federally sponsored space and terrestrial power research   During his tenure and under his initiative the IAPG saw its greatest increase in membership 
Bennett received his PhD in physics from Washington State University in 1970; a Master of Nuclear Science degree in 1966, and a BSc degree in physics from the University of Idaho in 1962; and an Associate of Arts degree from Boise Junior College (now Boise State University) in 1960 
Since 1995, he has been active in promoting the teaching of science (specifically evolution) and received the Friend of Darwin Award  Bennett has also been a champion of the First Amendment and was elected to the National Advisory Council of Americans United for Separation of Church and State 

Selected works
Bennett has authored or coauthored over 160 technical papers, reports and articles on power, propulsion, and space missions 
Science fiction

G L  Bennett (1980)  The Star Sailors  ISBN 978-0-312-75582-9 Chapters in:

M S  El-Genk (1997)  A Critical Review of Space Nuclear Power and Propulsion, 1984-1993  ISBN 978-1-56396-317-9 
D M  Rowe (1995)  CRC Handbook of Thermoelectrics  ISBN 978-0-8493-0146-9 
R A  Meyers (2001)  Encyclopedia of Physical Science and Technology (3rd ed )  ISBN 978-0-12-227410-7 

Awards
In 2000, he received the Friend of Darwin Award by the National Center for Science Education
In 1996, he received the Schreiber-Spence Space Achievement Award for his leadership of the safety and nuclear operations for the Galileo and Ulysses radioisotope power source programs 
In 1995, he shared in the American Institute of Aeronautics and Astronautics (AIAA) Aerospace Power Systems Award and Medal for his leadership of the Ulysses radioisotope power source program 
In 1994, he received the Silver & Gold Award from the University of Idaho Alumni Association
In 1990, he received the Distinguished Alumnus Award from Boise State University

Associations
American Institute of Aeronautics and Astronautics (fellow)
American Physical Society (fellow)
British Interplanetary Society (fellow)
Passage 2:
Planetary protection
Planetary protection is a guiding principle in the design of an interplanetary mission, aiming to prevent biological contamination of both the target celestial body and the Earth in the case of sample-return missions  Planetary protection reflects both the unknown nature of the space environment and the desire of the scientific community to preserve the pristine nature of celestial bodies until they can be studied in detail There are two types of interplanetary contamination  Forward contamination is the transfer of viable organisms from Earth to another celestial body   Back contamination is the transfer of extraterrestrial organisms, if they exist, back to the Earth's biosphere 

History
The potential problem of lunar and planetary contamination was first raised at the International Astronautical Federation VIIth Congress in Rome in 1956 In 1958 the U S  National Academy of Sciences (NAS) passed a resolution stating, “The National Academy of Sciences of the United States of America urges that scientists plan lunar and planetary studies with great care and deep concern so that initial operations do not compromise and make impossible forever after critical scientific experiments ” This led to creation of the ad hoc Committee on Contamination by Extraterrestrial Exploration (CETEX), which met for a year and recommended that interplanetary spacecraft be sterilized, and stated, “The need for sterilization is only temporary  Mars and possibly Venus need to remain uncontaminated only until study by manned ships becomes possible” In 1959, planetary protection was transferred to the newly formed Committee on Space Research (COSPAR)  COSPAR in 1964 issued Resolution 26 affirming that:

the search for extraterrestrial life is an important objective of space research, that the planet of Mars may offer the only feasible opportunity to conduct this search during the foreseeable future, that contamination of this planet would make such a search far more difficult and possibly even prevent for all time an unequivocal result, that all practical steps should be taken to ensure that Mars be not biologically contaminated until such time as this search has been satisfactorily carried out, and that cooperation in proper scheduling of experiments and use of adequate spacecraft sterilization techniques is required on the part of all deep space probe launching authorities to avoid such contamination 
In 1967, the US, USSR, and UK ratified the United Nations Outer Space Treaty   The legal basis for planetary protection lies in Article IX of this treaty:
"Article IX:     States Parties to the Treaty shall pursue studies of outer space, including the Moon and other celestial bodies, and conduct exploration of them so as to avoid their harmful contamination and also adverse changes in the environment of the Earth resulting from the introduction of extraterrestrial matter and, where necessary, shall adopt appropriate measures for this purpose    
This treaty has since been signed and ratified by 104 nation-states  Another 24 have signed but not ratified   All the current space-faring nation-states, along with all current aspiring space-faring nation-states, have both signed and ratified the treaty The Outer Space Treaty has consistent and widespread international support, and as a result of this, together with the fact that it is based on the 1963 declaration which was adopted by consensus in the UN National Assembly, it has taken on the status of customary international law  The provisions of the Outer Space Treaty are therefore binding on all states, even those who have neither signed nor ratified it For forward contamination, the phrase to be interpreted is "harmful contamination"   Two legal reviews came to differing interpretations of this clause (both reviews were unofficial)  However the currently accepted interpretation is that “any contamination which would result in harm to a state’s experiments or programs is to be avoided”  NASA policy states explicitly that “the conduct of scientific investigations of possible extraterrestrial life forms, precursors, and remnants must not be jeopardized” 

COSPAR recommendations and categories
The Committee on Space Research (COSPAR) meets every two years, in a gathering of 2000 to 3000 scientists, and one of its tasks is to develop recommendations for avoiding interplanetary contamination  Its legal basis is Article IX of the Outer Space Treaty  (see history below for details) 
Its recommendations depend on the type of space mission and the celestial body explored   COSPAR categorizes the missions into 5 groups:

Category I: Any mission to locations not of direct interest for chemical evolution or the origin of life, such as the  Sun or Mercury  No planetary protection requirements 
Category II: Any mission to locations of significant interest for chemical evolution and the origin of life, but only a remote chance that spacecraft-borne contamination could compromise investigations  Examples include the Moon, Venus, and comets  Requires simple documentation only, primarily to outline intended or potential impact targets, and an end of mission report of any inadvertent impact site if such occurred 
Category III: Flyby and orbiter missions to locations of significant interest for chemical evolution or the origin of life, and with a significant chance that contamination could compromise investigations e g , Mars, Europa, Enceladus  Requires more involved documentation than Category II  Other requirements, depending on the mission, may include trajectory biasing, clean room assembly, bioburden reduction, and if impact is a possibility, inventory of organics 
Category IV: Lander or probe missions to the same locations as Category III  Measures to be applied depend on the target body and the planned operations  "Sterilization of the entire spacecraft may be required for landers and rovers with life-detection experiments, and for those landing in or moving to a region where terrestrial microorganisms may survive and grow, or where indigenous life may be present  For other landers and rovers, the requirements would be for decontamination and partial sterilization of the landed hardware "Missions to Mars in category IV are subclassified further:Category IVa  Landers that do not search for Martian life - uses the Viking lander pre-sterilization requirements, a maximum of 300,000 spores per spacecraft and 300 spores per square meter 
Category IVb  Landers that search for Martian life   Adds stringent extra requirements to prevent contamination of samples 
Category IVc  Any component that accesses a Martian special region (see below) must be sterilized to at least to the Viking post-sterilization biological burden levels of 30 spores total per spacecraft Category V: This is further divided into unrestricted and restricted sample return Unrestricted Category V: samples from locations judged by scientific opinion to have no indigenous lifeforms  No special requirements 
Restricted Category V: (where scientific opinion is unsure) the requirements include: absolute prohibition of destructive impact upon return, containment of all returned hardware which directly contacted the target body, and containment of any unsterilized sample returned to Earth For Category IV missions, a certain level of biological burden is allowed for the mission  In general this is expressed as a 'probability of contamination', required to be less than one chance in 10,000 of forward contamination per mission, but in the case of Mars Category IV missions (above) the requirement has been translated into a count of Bacillus spores per surface area, as an easy to use assay method More extensive documentation is also required for Category IV  Other procedures required, depending on the mission, may include trajectory biasing, the use of clean rooms during spacecraft assembly and testing, bioload reduction, partial sterilization of the hardware having direct contact with the target body, a bioshield for that hardware, and, in rare cases, complete sterilization of the entire spacecraft For restricted Category V missions, the current recommendation is that no uncontained samples should be returned unless sterilized  Since sterilization of the returned samples would destroy much of their science value, current proposals involve containment and quarantine procedures  For details, see Containment and quarantine below  Category V missions also have to fulfill the requirements of Category IV to protect the target body from forward contamination 

Mars special regions
A special region is a region classified by COSPAR where terrestrial organisms could readily propagate, or thought to have a high potential for existence of Martian life forms  This is understood to apply to any region on Mars where liquid water occurs, or can occasionally occur, based on the current understanding of requirements for life 
If a hard landing risks biological contamination of a special region, then the whole lander system must be sterilized to COSPAR category IVc 

Target categories
Some targets are easily categorized  Others are assigned provisional categories by COSPAR, pending future discoveries and research 
The 2009 COSPAR Workshop on Planetary Protection for Outer Planet Satellites and Small Solar System Bodies covered this in some detail  Most of these assessments are from that report, with some future refinements  This workshop also gave more precise definitions for some of the categories:

Category I
“not of direct interest for understanding the process of chemical evolution or the origin of life ” 
Io, Sun, Mercury, undifferentiated metamorphosed asteroids

Category II
… where there is only a remote chance that contamination carried by a spacecraft could jeopardize future exploration”  In this case we define “remote chance” as “the absence of niches (places where terrestrial microorganisms could proliferate) and/or a very low likelihood of transfer to those places ” 
Callisto, comets, asteroids of category P, D, and C, Venus, Kuiper belt objects (KBO) < 1/2 size of Pluto 

Provisional Category II
Ganymede, Titan, Triton, the Pluto–Charon system, and other large KBOs (> 1/2 size of Pluto), CeresProvisionally, they assigned these objects to Category II  However, they state that more research is needed, because there is a remote possibility that the tidal interactions of Pluto and Charon could maintain some water reservoir below the surface  Similar considerations apply to the other larger KBOs 
Triton is insufficiently well understood at present to say it is definitely devoid of liquid water  The only close up observations to date are those of Voyager 2 
In a detailed discussion of Titan, scientists concluded that there was no danger of contamination of its surface, except short term adding of negligible amounts of organics, but Titan could have a below surface water reservoir that communicates with the surface, and if so, this could be contaminated 
In the case of Ganymede, the question is, given that its surface shows pervasive signs of resurfacing, is there any communication with its subsurface ocean? They found no known mechanism by which this could happen, and the Galileo spacecraft found no evidence of cryovolcanism  Initially, they assigned it as Priority B minus, meaning that precursor missions are needed to assess its category before any surface missions  However, after further discussion they provisionally assigned it to Category II, so no precursor missions are required, depending on future research 
If there is cryovolcanism on Ganymede or Titan, the undersurface reservoir is thought to be 50 – 150 km below the surface  They were unable to find a process that could transfer the surface melted water back down through 50 km of ice to the under surface sea  This is why both Ganymede and Titan were assigned a reasonably firm provisional Category II, but pending results of future research 
Icy bodies that show signs of recent resurfacing need further discussion and might need to be assigned to a new category depending on future research  This approach has been applied, for instance, to missions to Ceres  The planetary protection Category is subject for review during the mission of the Ceres orbiter (Dawn) depending on the results found 

Category III / IV
“…where there is a significant chance that contamination carried by a spacecraft could jeopardize future exploration ” We define “significant chance” as “the presence of niches (places where terrestrial microorganisms could proliferate) and the likelihood of transfer to those places ” 
Mars because of possible subsurface habitats 
Europa because of its subsurface ocean 
Enceladus because of evidence of water plumes 

Category V
Unrestricted Category V: “Earth-return missions from bodies deemed by scientific opinion to have no indigenous life forms ”
Restricted Category V: "Earth-return missions from bodies deemed by scientific opinion to be of significant interest to the process of chemical evolution or the origin of life "
In the category V for sample return the conclusions so far are:
Unrestricted Category V: Venus, the Moon 
Restricted Category V: Mars, Europa, Enceladus 

The Coleman–Sagan equation
The aim of the current regulations is to keep the number of microorganisms low enough so that the probability of contamination of Mars (and other targets) is acceptable  It is not an objective to make the probability of contamination zero 
The aim is to keep the probability of contamination of 1 chance in 10,000 of contamination per mission flown  This figure is obtained typically by multiplying together the number of microorganisms on the spacecraft, the probability of growth on the target body, and a series of bioload reduction factors 
In detail the method used is the Coleman–Sagan equation 
  
    
      
        P
        
          c
        
      
      =
      
        N
        
          0
        
      
      R
      
        P
        
          S
        
      
      
        P
        
          t
        
      
      
        P
        
          R
        
      
      
        P
        
          g
        
      
    
    P_{c}=N_{0}RP_{S}P_{t}P_{R}P_{g}
   
where 

  
    
      N
      
        0
      
    
    N_{0}
   = the number of microorganisms on the spacecraft initially

  
    R
    R
   = Reduction due to conditions on spacecraft before and after launch

  
    
      P
      
        S
      
    
    P_{S}
   = Probability that microorganisms on the spacecraft reach the surface of the planet

  
    
      P
      
        t
      
    
    P_{t}
   = Probability that spacecraft will hit the planet - this is 1 for a lander

  
    
      P
      
        R
      
    
    P_{R}
   = Probability of microorganism to be released in the environment when on the ground, usually set to 1 for crashlanding 

  
    
      P
      
        g
      
    
    P_{g}
   = Probability of growth  For targets with liquid water this is set to 1 for sake of the calculation Then the requirement is 
  
    
      
        P
        
          c
        
      
      <
      
        10
        
          −
          4
        
      
    
    P_{c}<10^{-4}
  
The 
  
    
      10
      
        −
        4
      
    
    10^{-4}
   is a number chosen by Sagan et al , somewhat arbitrarily  Sagan and Coleman assumed that about 60 missions to the Mars surface would occur before the exobiology of Mars is thoroughly understood, 54 of those successful, and 30 flybys or orbiters, and the number was chosen to endure a probability to keep the planet free from contamination of at least 99 9% over the duration of the exploration period 

Critiques
The Coleman–Sagan equation has been criticised because the individual parameters are often not known to better than a magnitude or so  For example, the thickness of the surface ice of Europa is unknown, and may be thin in places, which can give rise to a high level of uncertainty in the equation  It has also been criticised because of the inherent assumption made of an end to the protection period and future human exploration  In the case of Europa, this would only protect it with reasonable probability for the duration of the period of exploration Greenberg has suggested an alternative, to use the natural contamination standard — that our missions to Europa should not have a higher chance of contaminating it than the chance of contamination by meteorites from Earth 
As long as the probability of people infecting other planets with terrestrial microbes is substantially smaller than the probability that such contamination happens naturally, exploration activities would, in our view, be doing no harm  We call this concept the natural contamination standard 
Another approach for Europa is the use of binary decision trees which is favoured by the Committee on Planetary Protection Standards for Icy Bodies in the Outer Solar System under the auspices of the Space Studies Board  This goes through a series of seven steps, leading to a final decision on whether to go ahead with the mission or not 
Recommendation: Approaches to achieving planetary protection should not rely on the multiplication of bioload estimates and probabilities to calculate the likelihood of contaminating Solar System bodies with terrestrial organisms unless scientific data unequivocally define the values, statistical variation, and mutual independence of every factor used in the equation Recommendation: Approaches to achieving planetary protection for missions to icy Solar System bodies should employ a series of binary decisions that consider one factor at a time to determine the appropriate level of planetary protection procedures to use 

Containment and quarantine for restricted Category V sample return
In the case of restricted Category V missions, Earth would be protected through quarantine of sample and astronauts in a yet to be built Biosafety level 4 facility  In the case of a Mars sample return, missions would be designed so that no part of the capsule that encounters the Mars surface is exposed to the Earth environment  One way to do that is to enclose the sample container within a larger outer container from Earth, in the vacuum of space  The integrity of any seals is essential and the system must also be monitored to check for the possibility of micro-meteorite damage during return to Earth The recommendation of the ESF report is that
“No uncontained Mars materials, including space craft surfaces that have been exposed to the Mars environment should be returned to Earth unless sterilised"   "For unsterilised samples returned to Earth, a programme of life detection and biohazard testing, or a proven sterilisation process, shall be undertaken as an absolute precondition for the controlled distribution of any portion of the sample ”
No restricted category V returns have been carried out  During the Apollo program, the sample-returns were regulated through the Extra-Terrestrial Exposure Law  This was rescinded in 1991, so new regulations would need to be enacted  The Apollo era quarantine procedures are of interest as the only attempt to date of a return to Earth of a sample that, at the time, was thought to have a remote possibility of including extraterrestrial life 
Samples and astronauts were quarantined in the Lunar Receiving Laboratory  The methods used would be considered inadequate for containment by modern standards  Also the lunar receiving laboratory would be judged a failure by its own design criteria as the sample return didn't contain the lunar material, with two failure points during the Apollo 11 return mission, at the splashdown and at the facility itself 
However the Lunar Receiving Laboratory was built quickly with only two years from start to finish, a time period now considered inadequate  Lessons learned from it can help with design of any Mars sample return receiving facility Design criteria for a proposed Mars Sample Return Facility, and for the return mission, have been developed by the American National Research Council, and the European Space Foundation  They concluded that it could be based on biohazard 4 containment but with more stringent requirements to contain unknown microorganisms possibly as small as or smaller than the smallest Earth microorganisms known, the ultramicrobacteria  The ESF study also recommended that it should be designed to contain the smaller gene transfer agents if possible, as these could potentially transfer DNA from martian microorganisms to terrestrial microorganisms if they have a shared evolutionary ancestry  It also needs to double as a clean room facility to protect the samples from terrestrial contamination that could confuse the sensitive life detection tests that would be used on the samples 
Before a sample return, new quarantine laws would be required  Environmental assessment would also be required, and various other domestic and international laws not present during the Apollo era would need to be negotiated 

Decontamination procedures
For all spacecraft missions requiring decontamination, the starting point is clean room assembly in US federal standard class 100 cleanrooms  These are rooms with fewer than 100 particles of size 0 5 µm or larger per cubic foot  Engineers wear cleanroom suits with only their eyes exposed  Components are sterilized individually before assembly, as far as possible, and they clean surfaces frequently with alcohol wipes during assembly  Spores of Bacillus subtilis was chosen for not only its ability to readily generate spores, but its well-established use as a model species  It is a useful tracker of UV irradiation effects because of its high resilience to a variety of extreme conditions  As such it is an important indicator species for forward contamination in the context of planetary protection 
For Category IVa missions (Mars landers that do not search for Martian life), the aim is to reduce the bioburden to 300,000 bacterial spores on any surface from which the spores could get into the Martian environment  Any heat tolerant components are heat sterilized to 114 °C  Sensitive electronics such as the core box of the rover including the computer, are sealed and vented through high-efficiency filters to keep any microbes inside For more sensitive missions such as Category IVc (to Mars special regions), a far higher level of sterilization is required  These need to be similar to levels implemented on the Viking landers, which were sterilized for a surface which, at the time, was thought to be potentially hospitable to life similar to special regions on Mars today 
In microbiology, it is usually impossible to prove that there are no microorganisms left viable, since many microorganisms are either not yet studied, or not cultivable  Instead, sterilization is done using a series of tenfold reductions of the numbers of microorganisms present  After a sufficient number of tenfold reductions, the chance that there any microorganisms left will be extremely low The two Viking Mars landers were sterilized using dry heat sterilization   After preliminary cleaning to reduce the bioburden to levels similar to present day Category IVa spacecraft, the Viking spacecraft were heat-treated for 30 hours at 112 °C, nominal 125 °C (five hours at 112 °C was considered enough to reduce the population tenfold even for enclosed parts of the spacecraft, so this was enough for a million-fold reduction of the originally low population) Modern materials however are often not designed to handle such temperatures, especially since modern spacecraft often use "commercial off the shelf" components  Problems encountered include nanoscale features only a few atoms thick, plastic packaging, and conductive epoxy attachment methods  Also many instrument sensors cannot be exposed to high temperature, and high temperature can interfere with critical alignments of instruments As a result, new methods are needed to sterilize a modern spacecraft to the higher categories such as Category IVc for Mars, similar to Viking  Methods under evaluation, or already approved, include:

Vapour phase hydrogen peroxide - effective, but can affect finishes, lubricants and materials that use aromatic rings and sulfur bonds  This has been established, reviewed, and a NASA/ESA specification for use of VHP has been approved by the Planetary Protection Officer, but it has not yet been formally published 
Ethylene oxide - this is widely used in the medical industry, and can be used for materials not compatible with hydrogen peroxide  It is under consideration for missions such as ExoMars 
Gamma radiation and electron beams have been suggested as a method of sterilization, as they are used extensively in the medical industry  They need to be tested for compatibility with spacecraft materials and hardware geometries, and are not yet ready for review Some other methods are of interest as they can sterilize the spacecraft after arrival on the planet 
Supercritical carbon dioxide snow (Mars) - is most effective against traces of organic compounds rather than whole microorganisms  Has the advantage though that it eliminates the organic traces - while other methods kill the microorganisms, they leave organic traces that can confuse life detection instruments  Is under study by JPL and ESA 
Passive sterilization through UV radiation (Mars)  Highly effective against many microorganisms, but not all, as a Bacillus strain found in spacecraft assembly facilities is particularly resistant to UV radiation  Is also complicated by possible shadowing by dust and spacecraft hardware 
Passive sterilization through particle fluxes (Europa)  Plans for missions to Europa take credit for reductions due to this 

Bioburden detection and assessment
The spore count is used as an indirect measure of the number of microorganisms present  Typically 99% of microorganisms by species will be non-spore forming and able to survive in dormant states, and so the actual number of viable dormant microorganisms remaining on the sterilized spacecraft is expected to be many times the number of spore-forming microorganisms 
One new spore method approved is the "Rapid Spore Assay"  This is based on commercial rapid assay systems, detects spores directly and not just viable microorganisms and gives results in 5 hours instead of 72 hours 

Challenges
It is also long been recognized that spacecraft cleaning rooms harbour polyextremophiles as the only microbes able to survive in them  For example, in a recent study, microbes from swabs of the Curiosity rover were subjected to desiccation, UV exposure, cold and pH extremes  Nearly 11% of the 377 strains survived more than one of these severe conditions  The genomes of resistant spore producing Bacillus sp  have been studied and genome level traits potentially linked to the resistance have been reported This does not mean that these microbes have contaminated Mars  This is just the first stage of the process of bioburden reduction  To contaminate Mars they also have to survive the low temperature, vacuum, UV and ionizing radiation during the months long journey to Mars, and then have to encounter a habitat on Mars and start reproducing there  Whether this has happened or not is a matter of probability  The aim of planetary protection is to make this probability as low as possible  The currently accepted target probability of contamination per mission is to reduce it to less than 0 01%, though in the special case of Mars, scientists also rely on the hostile conditions on Mars to take the place of the final stage of heat treatment decimal reduction used for Viking  But with current technology scientists cannot reduce probabilities to zero 

New methods
Two recent molecular methods have been approved for assessment of microbial contamination on 
spacecraft surfaces 
Adenosine triphosphate (ATP) detection - this is a key element in cellular metabolism  This method is able to detect non cultivable organisms  It can also be triggered by non viable biological material so can give a "false positive" 
Limulus Amebocyte Lysate assay - detects lipopolysaccharides (LPS)  This compound is only present in Gram-negative bacteria  The standard assay analyses spores from microbes that are primarily Gram-positive, making it difficult to relate the two methods 

Impact prevention
This particularly applies to orbital missions, Category III, as they are sterilized to a lower standard than missions to the surface  It is also relevant to landers, as an impact gives more opportunity for forward contamination, and impact could be on an unplanned target, such as a special region on Mars 
The requirement for an orbital mission is that it needs to remain in orbit for at least 20 years after arrival at Mars with probability of at least 99% and for 50 years with probability at least 95%  This requirement can be dropped if the mission is sterilized to Viking sterilization standard In the Viking era (1970s), the requirement was given as a single figure, that any orbital mission should have a probability of less than 0 003% probability of impact during the current exploratory phase of exploration of Mars For both landers and orbiters, the technique of trajectory biasing is used during approach to the target  The spacecraft trajectory is designed so that if communications are lost, it will miss the target 

Issues with impact prevention
Despite these measures there has been one notable failure of impact prevention  The Mars Climate Orbiter which was sterilized only to Category III, crashed on Mars in 1999 due to a mix-up of imperial and metric units  The office of planetary protection stated that it is likely that it burnt up in the atmosphere, but if it survived to the ground, then it could cause forward contamination Mars Observer is another Category III mission with potential planetary contamination  Communications were lost three days before its orbital insertion maneuver in 1993  It seems most likely it did not succeed in entering into orbit around Mars and simply continued past on a heliocentric orbit  If it did succeed in following its automatic programming, and attempted the manoeuvre, however, there is a chance it crashed on Mars Three landers have had hard landings on Mars   These are Schiaparelli EDM lander, the Mars Polar Lander, and Deep Space 2  These were all sterilized for surface missions but not for special regions (Viking pre-sterilization only)  Mars Polar Lander, and Deep Space 2 crashed into the polar regions which are now treated as special regions because of the possibility of forming liquid brines 

Controversies
Meteorite argument
Alberto G  Fairén and Dirk Schulze-Makuch published an article in Nature recommending that planetary protection measures need to be scaled down  They gave as their main reason for this, that exchange of meteorites between Earth and Mars means that any life on Earth that could survive on Mars has already got there and vice versa Robert Zubrin used similar arguments in favour of his view that the back contamination risk has no scientific validity 

Rebuttal by NRC
The meteorite argument was examined by the NRC in the context of back contamination  It is thought that all the Martian meteorites originate in relatively few impacts every few million years on Mars  The impactors would be kilometers in diameter and the craters they form on Mars tens of kilometers in diameter  Models of impacts on Mars are consistent with these findings Earth receives a steady stream of meteorites from Mars, but they come from relatively few original impactors, and transfer was more likely in the early Solar System  Also some life forms viable on both Mars and on Earth might be unable to survive transfer on a meteorite, and there is so far no direct evidence of any transfer of life from Mars to Earth in this way 
The NRC concluded that though transfer is possible, the evidence from meteorite exchange does not eliminate the need for back contamination protection methods Impacts on Earth able to send microorganisms to Mars are also infrequent



ground_truth: University of Southern California

prompt_front: Answer the question based on the given passages. Only give me the answer and do not output any other words.

Question: Gary L. Bennett was a part of the space missions that have a primary destination of what celestial body?

The following are given passages.
Context 2:  Impactors of 10 km across or larger can send debris to Mars through the Earth's atmosphere but these occur rarely, and were more common in the early Solar System 

Proposal to end planetary protection for Mars
In their 2013 paper "The Over Protection of Mars", Alberto Fairén and Dirk Schulze-Makuch suggested that we no longer need to protect Mars, essentially using Zubrin's meteorite transfer argument  This was rebutted in a follow up article "Appropriate Protection of Mars", in Nature by the current and previous planetary protection officers Catharine Conley and John Rummel 

Critique of Category V containment measures
The scientific consensus is that the potential for large-scale effects, either through pathogenesis or ecological disruption, is extremely small  Nevertheless, returned samples from Mars will be treated as potentially biohazardous until scientists can determine that the returned samples are safe  The goal is to reduce the probability of release of a Mars particle to less than one in a million 

Policy proposals
Non-biological contamination
A COSPAR workshop in 2010, looked at issues to do with protecting areas from non biological contamination  They recommended that COSPAR expand its remit to include such issues  Recommendations of the workshop include:

Recommendation 3 COSPAR should add a separate and parallel policy to provide guidance on requirements/best practices for protection of non-living/nonlife-related aspects of Outer Space and celestial bodies
Some ideas proposed include protected special regions, or "Planetary Parks" to keep regions of the Solar System pristine for future scientific investigation, and also for ethical reasons 

Proposed extensions
Astrobiologist Christopher McKay has argued that until we have better understanding of Mars, our explorations should be biologically reversible  For instance if all the microorganisms introduced to Mars so far remain dormant within the spacecraft, they could in principle be removed in the future, leaving Mars completely free of contamination from modern Earth lifeforms 
In the 2010 workshop one of the recommendations for future consideration was to extend the period for contamination prevention to the maximum viable lifetime of dormant microorganisms introduced to the planet 

"'Recommendation 4 ' COSPAR should consider that the appropriate protection of potential indigenous extraterrestrial life shall include avoiding the harmful contamination of any habitable environment —whether extant or foreseeable— within the maximum potential time of viability of any terrestrial organisms (including microbial spores) that may be introduced into that environment by human or robotic activity "
In the case of Europa, a similar idea has been suggested, that it is not enough to keep it free from contamination during our current exploration period  It might be that Europa is of sufficient scientific interest that the human race has a duty to keep it pristine for future generations to study as well  This was the majority view of the 2000 task force examining Europa, though there was a minority view of the same task force that such strong protection measures are not required 

"One consequence of this view is that Europa must be protected from contamination for an open-ended period, until it can be demonstrated that no ocean exists or that no organisms are present  Thus, we need to be concerned that over a time scale on the order of 10 million to 100 million years (an approximate age for the surface of Europa), any contaminating material is likely to be carried into the deep ice crust or into the underlying ocean "
In July 2018, the National Academies of Sciences, Engineering, and Medicine issued a Review and Assessment of Planetary Protection Policy Development Processes  In part, the report urges NASA to create a broad strategic plan that covers both forward and back contamination  The report also expresses concern about private industry missions, for which there is no governmental regulatory authority 

Protecting objects beyond the Solar System
The proposal by the German physicist Claudius Gros, that the technology of the Breakthrough Starshot project may be utilized to establish a biosphere of unicellular organisms on otherwise only transiently habitable exoplanets, has sparked a discussion, to what extent planetary protection should be extended to exoplanets  Gros argues that the extended timescales of
interstellar missions imply that planetary and exoplanetary protection have different ethical groundings 

See also
Astrobiology – Science concerned with life in the universe
ExoMars – Astrobiology programme
List of microorganisms tested in outer space
Mars 2020 – Astrobiology Mars rover mission by NASA
Panspermia – Hypothesis on the interstellar spreading of primordial life
Passage 3:
Transit (astronomy)
In astronomy, a transit (or astronomical transit) is a phenomenon when a celestial body passes directly between a larger body and the observer  As viewed from a particular vantage point, the transiting body appears to move across the face of the larger body, covering a small portion of it The word "transit" refers to cases where the nearer object appears smaller than the more distant object  Cases where the nearer object appears larger and completely hides the more distant object are known as occultations 
However, the probability of seeing a transiting planet is low because it is dependent on the alignment of the three objects in a nearly perfectly straight line  Many parameters of  a planet and its parent star can be determined based on the transit 

In the Solar System
One example of a transit involves the motion of a planet between a terrestrial observer and the Sun  This can happen only with inferior planets, namely Mercury and Venus (see transit of Mercury and transit of Venus)  However, because a transit is dependent on the point of observation, the Earth itself transits the Sun if observed from Mars  In the solar transit by the Moon captured during calibration of the STEREO B spacecraft's ultraviolet imaging, the Moon appears much smaller than it does when seen from Earth, because the spacecraft–Moon separation was several times greater than the Earth–Moon distance 
The term can also be used to describe the motion of a satellite across its parent planet, for instance one of the Galilean satellites (Io, Europa, Ganymede, Callisto) across Jupiter, as seen from Earth 
Although rare, cases where four bodies are lined up do happen  One of these events occurred on 27 June 1586, when Mercury transited the Sun as seen from Venus at the same time as a transit of Mercury from Saturn and a transit of Venus from Saturn 

Notable observations
No missions were planned to coincide with the transit of Earth visible from Mars on 11 May 1984 and the Viking missions had been terminated a year previously  Consequently, the next opportunity to observe such an alignment will be in 2084 
On 21 December 2012, the Cassini–Huygens probe, in orbit around Saturn, observed the planet Venus transiting the Sun On 3 June 2014, the Mars rover Curiosity observed the planet Mercury transiting the Sun, marking the first time a planetary transit has been observed from a celestial body besides Earth 

Mutual planetary transits
In rare cases, one planet can pass in front of another  If the nearer planet appears smaller than the more distant one, the event is called a mutual planetary transit 

Outside the Solar System
Exoplanet Detection

The transit method can be used to discover exoplanets  As a planet eclipses/transits its host star it will block a portion of the light from the star  If the planet transits in-between the star and the observer the change in light can be measured to construct a light curve  Light curves are measured with a charge-coupled device  The light curve of a star can disclose several physical characteristics of the planet and star, such as density  Multiple transit events must be measured to determine the characteristics which tend to occur at regular intervals  Multiple planets orbiting the same host star can cause transit-timing variations (TTV)  TTV is caused by the gravitational forces of all orbiting bodies acting upon each other  The probability of seeing a transit from Earth is low, however  The probability is given by the following equation 

  
    
      
        
          P
          
            transit
          
        
        =
        (
        
          R
          
            star
          
        
        +
        
          R
          
            planet
          
        
        )
        
          /
        
        a
        ,
      
    
    {\displaystyle P_{\text{transit}}=(R_{\text{star}}+R_{\text{planet}})/a,}
  where Rstar and Rplanet are the radius of the star and planet, respectively, and a is the semi-major axis  Because of the low probability of a transit in any specific system, large selections of the sky must be regularly observed in order to see a transit  Hot Jupiters are more likely to be seen because of their larger radius and short semi-major axis  In order to find Earth-sized planets, red dwarf stars are observed because of their small radius  Even though transiting has a low probability it has proven itself to be a good technique for discovering exoplanets 
In recent years, the discovery of extrasolar planets has prompted interest in the possibility of detecting their transits across their own stellar primaries  HD 209458b was the first such transiting planet to be detected 
The transit of celestial objects is one of the few key phenomena used today for the study of exoplanetary systems  Today, transit photometry is the leading form of exoplanet discovery  As an exoplanet moves in front of its host star there is a dimming in the luminosity of the host star that can be measured  Larger planets make the dip in luminosity more noticeable and easier to detect  Followup observations using other methods are often carried out to ensure it is a planet 
There are currently (December 2018) 2345 planets confirmed with Kepler light curves for stellar host 

Contacts
During a transit there are four "contacts", when the circumference of the small circle (small body disk) touches the circumference of the large circle (large body disk) at a single point   Historically, measuring the precise time of each point of contact was one of the most accurate ways to determine the positions of astronomical bodies   The contacts happen in the following order:

First contact: the smaller body is entirely outside the larger body, moving inward ("exterior ingress")
Second contact: the smaller body is entirely inside the larger body, moving further inward ("interior ingress")
Third contact: the smaller body is entirely inside the larger body, moving outward ("interior egress")
Fourth contact: the smaller body is entirely outside the larger body, moving outward ("exterior egress")A fifth named point is that of greatest transit, when the apparent centers of the two bodies are nearest to each other, halfway through the transit 

Missions
Since transit photometry allows for scanning large celestial areas with a simple procedure, it has been the most popular and successful form of finding exoplanets in the past decade and includes many projects, some of which have already been retired, others in use today, and some in progress of being planned and created  The most successful projects include HATNet, KELT, Kepler, and WASP, and some new and developmental stage missions such as TESS, HATPI, and others which can be found among the List of Exoplanet Search Projects 

HATNet
HATNet Project is a set of northern telescopes in Fred Lawrence Whipple Observatory, Arizona and Mauna Kea Observatories, HI, and southern telescopes around the globe, in Africa, Australia, and South America, under the HATSouth branch of the project  These are small aperture telescopes, just like KELT, and look at a wide field which allows them to scan a large area of the sky for possible transiting planets  In addition, their multitude and spread around the world allows for 24/7 observation of the sky so that more short-period transits can be caught A third sub-project, HATPI, is currently under construction and will survey most of the night sky seen from its location in Chile 

KELT
KELT is a terrestrial telescope mission designed to search for transiting systems of planets of magnitude 8<M<10  It began operation in October 2004 in Winer Observatory and has a southern companion telescope added in 2009  KELT North observes "26-degree wide strip of sky that is overhead from North America during the year", while KELT South observes single target areas of the size 26 by 26 degrees  Both telescopes can detect and identify transit events as small as a 1% flux dip, which allows for detection of planetary systems similar to those in our planetary system 

Kepler / K2
The Kepler satellite served the Kepler mission between 7 March 2009 and 11 May 2013, where it observed one part of the sky in search of transiting planets within a 115 square degrees of the sky around the Cygnus, Lyra, and Draco constellations  After that, the satellite continued operating until 15 November 2018, this time changing its field along the ecliptic to a new area roughly every 75 days due to reaction wheel failure 

TESS
TESS was launched on 18 April 2018, and is planned to survey most of the sky by observing it strips defined along the right ascension lines for 27 days each  Each area surveyed is 27 by 90 degrees  Because of the positioning of sections, the area near TESS's rotational axis will be surveyed for up to 1 year, allowing for the identification of planetary systems with longer orbital periods 

See also
Eclipse
Kepler Mission
Occultation
Syzygy (astronomy)
Conjunction (astronomy)
Opposition (planets)
Transit of asteroids
Transit of Deimos from Mars
Transit of Phobos from Mars
Transit of Vulcan
Transit of Mercury from Mars
Transit of Earth from Mars
Passage 4:
Roche limit
In celestial mechanics, the Roche limit, also called Roche radius, is the distance from a celestial body within which a second celestial body, held together only by its own force of gravity, will disintegrate because the first body's tidal forces exceed the second body's self-gravitation  Inside the Roche limit, orbiting material disperses and forms rings, whereas outside the limit, material tends to coalesce  The Roche radius depends on the radius of the first body and on the ratio of the bodies' densities 
The term is named after Édouard Roche (French: [ʁɔʃ], English:  ROSH), the French astronomer who first calculated this theoretical limit in 1848 

Explanation
The Roche limit typically applies to a satellite's disintegrating due to tidal forces induced by its primary, the body around which it orbits  Parts of the satellite that are closer to the primary are attracted more strongly by gravity from the primary than parts that are farther away; this disparity effectively pulls the near and far parts of the satellite apart from each other, and if the disparity (combined with any centrifugal effects due to the object's spin) is larger than the force of gravity holding the satellite together, it can pull the satellite apart  Some real satellites, both natural and artificial, can orbit within their Roche limits because they are held together by forces other than gravitation  Objects resting on the surface of such a satellite would be lifted away by tidal forces  A weaker satellite, such as a comet, could be broken up when it passes within its Roche limit 
Since, within the Roche limit, tidal forces overwhelm the gravitational forces that might otherwise hold the satellite together, no satellite can gravitationally coalesce out of smaller particles within that limit  Indeed, almost all known planetary rings are located within their Roche limit  (Notable exceptions are Saturn's E-Ring and Phoebe ring  These two rings could possibly be remnants from the planet's proto-planetary accretion disc that failed to coalesce into moonlets, or conversely have formed when a moon passed within its Roche limit and broke apart )
The Roche limit is not the only factor that causes comets to break apart  Splitting by thermal stress, internal gas pressure and rotational splitting are other ways for a comet to split under stress 

Determination
The limiting distance to which a satellite can approach without breaking up depends on the rigidity of the satellite  At one extreme, a completely rigid satellite will maintain its shape until tidal forces break it apart  At the other extreme, a highly fluid satellite gradually deforms leading to increased tidal forces, causing the satellite to elongate, further compounding the tidal forces and causing it to break apart more readily 
Most real satellites would lie somewhere between these two extremes, with tensile strength rendering the satellite neither perfectly rigid nor perfectly fluid  For example, a rubble-pile asteroid will behave more like a fluid than a solid rocky one; an icy body will behave quite rigidly at first but become more fluid as tidal heating accumulates and its ices begin to melt 
But note that, as defined above, the Roche limit refers to a body held together solely by the gravitational forces which cause otherwise unconnected particles to coalesce, thus forming the body in question  The Roche limit is also usually calculated for the case of a circular orbit, although it is straightforward to modify the calculation to apply to the case (for example) of a body passing the primary on a parabolic or hyperbolic trajectory 

Rigid satellites
The rigid-body Roche limit is a simplified calculation for a spherical satellite  Irregular shapes such as those of tidal deformation on the body or the primary it orbits are neglected  It is assumed to be in hydrostatic equilibrium  These assumptions, although unrealistic, greatly simplify calculations 
The Roche limit for a rigid spherical satellite is the distance, 
  
    
      
        d
      
    
    {\displaystyle d}
  , from the primary at which the gravitational force on a test mass at the surface of the object is exactly equal to the tidal force pulling the mass away from the object:

  
    
      
        d
        =
        
          R
          
            M
          
        
        
          
            (
            
              2
              
                
                  
                    ρ
                    
                      M
                    
                  
                  
                    ρ
                    
                      m
                    
                  
                
              
            
            )
          
          
            
              1
              3
            
          
        
      
    
    {\displaystyle d=R_{M}\left(2{\frac {\rho _{M}}{\rho _{m}}}\right)^{\frac {1}{3}}}
  where 
  
    
      
        
          R
          
            M
          
        
      
    
    {\displaystyle R_{M}}
   is the radius of the primary, 
  
    
      
        
          ρ
          
            M
          
        
      
    
    {\displaystyle \rho _{M}}
   is the density of the primary, and 
  
    
      
        
          ρ
          
            m
          
        
      
    
    {\displaystyle \rho _{m}}
   is the density of the satellite  This can be equivalently written as

  
    
      
        d
        =
        
          R
          
            m
          
        
        
          
            (
            
              2
              
                
                  
                    M
                    
                      M
                    
                  
                  
                    M
                    
                      m
                    
                  
                
              
            
            )
          
          
            
              1
              3
            
          
        
      
    
    {\displaystyle d=R_{m}\left(2{\frac {M_{M}}{M_{m}}}\right)^{\frac {1}{3}}}
  where 
  
    
      
        
          R
          
            m
          
        
      
    
    {\displaystyle R_{m}}
   is the radius of the secondary, 
  
    
      
        
          M
          
            M
          
        
      
    
    {\displaystyle M_{M}}
   is the mass of the primary, and 
  
    
      
        
          M
          
            m
          
        
      
    
    {\displaystyle M_{m}}
   is the mass of the secondary 
This does not depend on the size of the objects, but on the ratio of densities  This is the orbital distance inside of which loose material (e g  regolith) on the surface of the satellite closest to the primary would be pulled away, and likewise material on the side opposite the primary will also go away from, rather than toward, the satellite 

Fluid satellites
A more accurate approach for calculating the Roche limit takes the deformation of the satellite into account  An extreme example would be a tidally locked liquid satellite orbiting a planet, where any force acting upon the satellite would deform it into a prolate spheroid 
The calculation is complex and its result cannot be represented in an exact algebraic formula  Roche himself derived the following approximate solution for the Roche limit:

  
    
      
        d
        ≈
        2 44
        R
        
          
            (
            
              
                
                  ρ
                  
                    M
                  
                
                
                  ρ
                  
                    m
                  
                
              
            
            )
          
          
            1
            
              /
            
            3
          
        
      
    
    {\displaystyle d\approx 2 44R\left({\frac {\rho _{M}}{\rho _{m}}}\right)^{1/3}}
  However, a better approximation that takes into account the primary's oblateness and the satellite's mass is:

  
    
      
        d
        ≈
        2 423
        R
        
          
            (
            
              
                
                  ρ
                  
                    M
                  
                
                
                  ρ
                  
                    m
                  
                
              
            
            )
          
          
            1
            
              /
            
            3
          
        
        
          
            (
            
              
                
                  (
                  1
                  +
                  
                    
                      m
                      
                        3
                        M
                      
                    
                  
                  )
                  +
                  
                    
                      c
                      
                        3
                        R
                      
                    
                  
                  (
                  1
                  +
                  
                    
                      m
                      M
                    
                  
                  )
                
                
                  1
                  −
                  c
                  
                    /
                  
                  R
                
              
            
            )
          
          
            1
            
              /
            
            3
          
        
      
    
    {\displaystyle d\approx 2 423R\left({\frac {\rho _{M}}{\rho _{m}}}\right)^{1/3}\left({\frac {(1+{\frac {m}{3M}})+{\frac {c}{3R}}(1+{\frac {m}{M}})}{1-c/R}}\right)^{1/3}}
  where 
  
    
      
        c
        
          /
        
        R
      
    
    {\displaystyle c/R}
   is the oblateness of the primary  The numerical factor is calculated with the aid of a computer 
The fluid solution is appropriate for bodies that are only loosely held together, such as a comet  For instance, comet Shoemaker–Levy 9's decaying orbit around Jupiter passed within its Roche limit in July 1992, causing it to fragment into a number of smaller pieces  On its next approach in 1994 the fragments crashed into the planet  Shoemaker–Levy 9 was first observed in 1993, but its orbit indicated that it had been captured by Jupiter a few decades prior 

See also
Roche lobe
Chandrasekhar limit
Hill sphere
Spaghettification (the extreme case of tidal distortion)
Black hole
Triton (moon) (Neptune's satellite)
Comet Shoemaker–Levy 9
Passage 5:
Ulysses (spacecraft)
Ulysses ( yoo-LISS-eez, UK also  YOO-liss-eez) was a robotic space probe whose primary mission was to orbit the Sun and study it at all latitudes  It was launched in 1990 and made three "fast latitude scans" of the Sun in 1994/1995, 2000/2001, and 2007/2008  In addition, the probe studied several comets  Ulysses was a joint venture of the European Space Agency (ESA) and the United States' National Aeronautics and Space Administration (NASA), under leadership of ESA with participation from Canada's National Research Council  The last day for mission operations on Ulysses was 30 June 2009 To study the Sun at all latitudes, the probe needed to change its orbital inclination and leave the plane of the Solar System  To change the orbital inclination of a spacecraft to about 80° requires a large change in heliocentric velocity, the energy to achieve which far exceeded the capabilities of any launch vehicle  To reach the desired orbit around the Sun, the mission's planners chose a gravity assist maneuver around Jupiter, but this Jupiter encounter meant that Ulysses could not be powered by solar cells  The probe was powered instead by a radioisotope thermoelectric generator (RTG) 
The spacecraft was originally named Odysseus, because of its lengthy and indirect trajectory to study the solar poles  It was renamed Ulysses, the Latin translation of "Odysseus", at ESA's request in honor not only of Homer's mythological hero but also of Dante's character in the Inferno  Ulysses was originally scheduled for launch in May 1986 aboard the Space Shuttle Challenger on STS-61-F  Due to the 28 January 1986 loss of Challenger, the launch of Ulysses was delayed until 6 October 1990 aboard Discovery (mission STS-41) 

Spacecraft
The spacecraft was designed by ESA and built by Dornier Systems, a German aircraft manufacturer  The body was roughly a box, approximately 3 2 m × 3 3 m × 2 1 m (10 5 ft × 10 8 ft × 6 9 ft) in size  The box mounted the 1 65 m (5 ft 5 in) dish antenna and the GPHS-RTG radioisotope thermoelectric generator (RTG) power source  The box was divided into noisy and quiet sections  The noisy section abutted the RTG; the quiet section housed the instrument electronics  Particularly "loud" components, such as the preamps for the radio dipole, were mounted outside the structure entirely, and the box acted as a Faraday cage 
Ulysses was spin-stabilised about its z-axis which roughly coincides with the axis of the dish antenna  The RTG, whip antennas, and instrument boom were placed to stabilize this axis, with the spin rate nominally at 5 rpm  Inside the body was a hydrazine fuel tank  Hydrazine monopropellant was used for course corrections inbound to Jupiter, and later used exclusively to repoint the spin axis (and thus, the antenna) at Earth  The spacecraft was controlled by eight thrusters in two blocks  Thrusters were pulsed in the time domain to perform rotation or translation  Four sun sensors detected orientation  For fine attitude control, the S-band antenna feed was mounted slightly off-axis  This offset feed combined with the spacecraft spin introduced an apparent oscillation to a radio signal transmitted from Earth when received on board the spacecraft  The amplitude and phase of this oscillation were proportional to the orientation of the spin axis relative to the Earth direction  This method of determining the relative orientation is called conical scanning and was used by early radars for automated tracking of targets and was also very common in early infrared guided missiles 
The spacecraft used S-band for uplinked commands and downlinked telemetry, through dual redundant 5-watt transceivers  The spacecraft used X-band for science return (downlink only), using dual 20 watts TWTAs until the failure of the last remaining TWTA in January 2008  Both bands used the dish antenna with prime-focus feeds, unlike the Cassegrain feeds of most other spacecraft dishes 
Dual tape recorders, each of approximately 45-megabit capacity, stored science data between the nominal eight-hour communications sessions during the prime and extended mission phases 
The spacecraft was designed to withstand both the heat of the inner Solar System and the cold at Jupiter's distance  Extensive blanketing and electric heaters protected the probe against the cold temperatures of the outer Solar System 
Multiple computer systems (CPUs/microprocessors/Data Processing Units) are used in several of the scientific instruments, including several radiation-hardened RCA CDP1802 microprocessors  Documented 1802 usage includes dual-redundant 1802s in the COSPIN, and at least one 1802 each in the GRB, HI-SCALE, SWICS, SWOOPS and URAP instruments, with other possible microprocessors incorporated elsewhere Total mass at launch was 371 kg (818 lb), of which 33 5 kg was hydrazine propellant used for attitude control and orbit correction 

Instruments
The twelve different Instruments came from ESA and NASA  The first design was based on two probes, one by NASA and one by ESA, but the probe of NASA was defunded and in the end the instruments of the cancelled probe were mounted on Ulyssses 
Radio/Plasma antennas: Two beryllium copper antennas were unreeled outwards from the body, perpendicular to the RTG and spin axis  Together this dipole spanned 72 meters (236 2 ft)  A third antenna, of hollow beryllium copper, was deployed from the body, along the spin axis opposite the dish  It was a monopole antenna, 7 5 meters (24 6 ft) long  These measured radio waves generated by plasma releases, or the plasma itself as it passed over the spacecraft  This receiver ensemble was sensitive from DC to 1 MHz 
Experiment Boom: A third type of boom, shorter and much more rigid, extended from the last side of the spacecraft, opposite the RTG  This was a hollow carbon-fiber tube, of 50 mm (2 in ) diameter  It can be seen in the photo as the silver rod stowed alongside the body  It carried four types of instruments: a solid-state X-ray instrument, composed of two silicon detectors, to study X-rays from solar flares and Jupiter's aurorae; the Gamma-Ray Burst experiment, consisting of two CsI scintillator crystals with photomultipliers; two different magnetometers, a helium vector magnetometer and a fluxgate magnetometer; and a two-axis magnetic search coil antenna measured AC magnetic fields 
Body-Mounted Instruments: Detectors for electrons, ions, neutral gas, dust, and cosmic rays were mounted on the spacecraft body around the quiet section 
Lastly, the radio communications link could be used to search for gravitational waves (through Doppler shifts) and to probe the Sun's atmosphere through radio occultation  No gravitational waves were detected 
Total instrument mass was 55 kg 
Magnetometer (MAG): MAG measured the magnetic field in the heliosphere  Measurements of Jupiter's magnetic field were also performed 
Solar Wind Plasma Experiment (SWOOPS): detected the solar wind at all solar distances and latitudes and in three dimensions  It measured positive ions and electrons 
Solar Wind Ion Composition Instrument (SWICS): determined composition, temperature and speed of the atoms and ions that comprise the solar wind 
Unified Radio and Plasma Wave Instrument (URAP): picked up radio waves from the Sun and electromagnetic waves generated in the solar wind close to the spacecraft 
Energetic Particle Instrument (EPAC) and GAS: EPAC investigated the energy, fluxes and distribution of energetic particles in the heliosphere  GAS studied the uncharged gases (helium) of interstellar origin 
Low-Energy Ion and Electron Experiment (HI-SCALE): investigated the energy, fluxes and distribution of energetic particles in the heliosphere 
Cosmic Ray and Solar Particle Instrument (COSPIN): investigated the energy, fluxes and distribution of energetic particles and galactic cosmic rays in the heliosphere 
Solar X-ray and Cosmic Gamma-Ray Burst Instrument (GRB): studied cosmic gamma ray bursts and X-rays from solar flares 
Dust Experiment (DUST): Direct measurements of interplanetary and interstellar dust grains to investigate their properties as functions of the distance from the Sun and solar latitude 

Mission
Planning
Until Ulysses, the Sun had only been observed from low solar latitudes  The Earth's orbit defines the ecliptic plane, which differs from the Sun's equatorial plane by only 7 25°  Even spacecraft directly orbiting the Sun do so in planes close to the ecliptic because a direct launch into a high-inclination solar orbit would require a prohibitively large launch vehicle 
Several spacecraft (Mariner 10, Pioneer 11, and Voyagers 1 and 2) had performed gravity assist maneuvers in the 1970s  Those maneuvers were to reach other planets also orbiting close to the ecliptic, so they were mostly in-plane changes  However, gravity assists are not limited to in-plane maneuvers; a suitable flyby of Jupiter could produce a significant plane change  An Out-Of-The-Ecliptic mission (OOE) was thereby proposed  See article Pioneer H 
Originally, two spacecraft were to be built by NASA and ESA, as the International Solar Polar Mission  One would be sent over Jupiter, then under the Sun  The other would fly under Jupiter, then over the Sun  This would provide simultaneous coverage  Due to cutbacks, the U S  spacecraft was cancelled in 1981  One spacecraft was designed, and the project recast as Ulysses, due to the indirect and untried flight path  NASA would provide the Radioisotope Thermoelectric Generator (RTG) and launch services, ESA would build the spacecraft assigned to Astrium GmbH, Friedrichshafen, Germany (formerly Dornier Systems)  The instruments would be split into teams from universities and research institutes in Europe and the United States  This process provided the 12 instruments on board 
The changes delayed launch from February 1983 to May 1986 when it was to be deployed by the Space Shuttle Challenger (boosted by the proposed Centaur G Prime upper stage  However, the Challenger disaster forced a two-and-a-half year stand down of the shuttle fleet, mandated the cancellation of the Centaur-G upper stage, and pushed the launch date to October 1990 

Launch
Ulysses was deployed into low Earth orbit from the Space Shuttle Discovery  From there, it was propelled on a trajectory to Jupiter by a combination of solid rocket motors  This upper stage consisted of a two-stage Boeing IUS (Inertial Upper Stage), plus a McDonnell Douglas PAM-S (Payload Assist Module-Special)  The IUS was inertially stabilised and actively guided during its burn  The PAM-S was unguided and it and Ulysses were spun up to 80 rpm for stability at the start of its burn  On burnout of the PAM-S, the motor and spacecraft stack was yo-yo de-spun (weights deployed at the end of cables) to below 8 rpm prior to separation of the spacecraft  On leaving Earth, the spacecraft became the fastest ever artificially-accelerated spacecraft, and held that title until the New Horizons probe was launched 
On its way to Jupiter, the spacecraft was in an elliptical non-Hohmann transfer orbit  At this time, Ulysses had a low orbital inclination to the ecliptic 

Jupiter swing-by
It arrived at Jupiter on 8 February 1992 for a swing-by maneuver that increased its inclination to the ecliptic by 80 2°  The giant planet's gravity bent the spacecraft's flight path southward and away from the ecliptic plane  This put it into a final orbit around the Sun that would take it past the Sun's north and south poles  The size and shape of the orbit were adjusted to a much smaller degree so that aphelion remained at approximately 5 AU, Jupiter's distance from the Sun, and perihelion was somewhat greater than 1 AU, the Earth's distance from the Sun  The orbital period is approximately six years 

Polar regions of the Sun
Between 1994 and 1995 it explored both the southern and northern polar regions of the Sun, respectively 

Comet C/1996 B2 (Hyakutake)
On 1 May 1996, the spacecraft unexpectedly crossed the ion tail of Comet Hyakutake (C/1996 B2), revealing the tail to be at least 3 8 AU in length 

Comet C/1999 T1 (McNaught–Hartley)
An encounter with a comet tail happened again in 2004  when Ulysses flew through the ion tailings of C/1999 T1 (McNaught-Hartley)  A coronal mass ejection carried the cometary material to Ulysses 

Second Jupiter encounter
Ulysses approached aphelion in 2003/2004 and made further distant observations of Jupiter 

Comet C/2006 P1 (McNaught)
In 2007, Ulysses passed through the tail of comet C/2006 P1 (McNaught)  The results were surprisingly different from its pass through Hyakutake's tail, with the measured solar wind velocity dropping from approximately 700 kilometers per second (1,566,000 mph) to less than 400 kilometers per second (895,000 mph) 

Extended mission
ESA's Science Program Committee approved the fourth extension of the Ulysses mission to March 2004  thereby allowing it to operate over the Sun's poles for the third time in 2007 and 2008  After it became clear that the power output from the spacecraft's RTG would be insufficient to operate science instruments and keep the attitude control fuel, hydrazine, from freezing, instrument power sharing was initiated  Up until then, the most important instruments had been kept online constantly, whilst others were deactivated  When the probe neared the Sun, its power-hungry heaters were turned off and all instruments were turned on On 22 February 2008, 17 years and 4 months after the launch of the spacecraft, ESA and NASA announced that the mission operations for Ulysses would likely cease within a few months  On 12 April 2008, NASA announced that the end date will be 1 July 2008 The spacecraft operated successfully for over four times its design life  A component within the last remaining working chain of X-band downlink subsystem failed on 15 January 2008  The other chain in the X-band subsystem had previously failed in 2003 Downlink to Earth resumed on S-band, but the beamwidth of the high gain antenna in the S-band was not as narrow as in the X–band, so that the received downlink signal was much weaker, hence reducing the achievable data rate  As the spacecraft traveled on its outbound trajectory to the orbit of Jupiter, the downlink signal would have eventually fallen below the receiving capability of even the largest antennas (70 meters - 229 7 feet - in diameter) of the Deep Space Network 
Even before the downlink signal was lost due to distance, the hydrazine attitude control fuel on board the spacecraft was considered likely to freeze, as the radioisotope thermal generators (RTGs) failed to generate enough power for the heaters to overcome radiative heat loss into space  Once the hydrazine froze, the spacecraft would no longer be able to maneuver to keep its high gain antenna pointing towards Earth, and the downlink signal would then be lost in a matter of days  The failure of the X-band communications subsystem hastened this, because the coldest part of the fuel pipework was routed over the X-band traveling-wave tube amplifiers, because they generated enough heat during operation to keep the propellant plumbing warm 
The previously announced mission end date of 1 July 2008, came and went but mission operations continued albeit in a reduced capacity  The availability of science data gathering was limited to only when Ulysses was in contact with a ground station due to the deteriorating S-band downlink margin no longer being able to support simultaneous real-time data and tape recorder playback  When the spacecraft was out of contact with a ground station, the S-band transmitter was switched off and the power was diverted to the internal heaters to add to the warming of the hydrazine  On 30 June 2009, ground controllers sent commands to switch to the low gain antennas  This stopped communications with the spacecraft, in combination with previous commands to shut down its transmitter entirely 

Results
During cruise phases, Ulysses provided unique data  As the only spacecraft out of the ecliptic with a gamma-ray instrument, Ulysses was an important part of the InterPlanetary Network (IPN)  The IPN detects gamma ray bursts (GRBs); since gamma rays cannot be focused with mirrors, it was very difficult to locate GRBs with enough accuracy to study them further  Instead, several spacecraft can locate the burst through multilateration  Each spacecraft has a gamma-ray detector, with readouts noted in tiny fractions of a second  By comparing the arrival times of gamma showers with the separations of the spacecraft, a location can be determined, for follow-up with other telescopes  Because gamma rays travel at the speed of light, wide separations are needed  Typically, a determination came from comparing: one of several spacecraft orbiting the Earth, an inner-Solar-system probe (to Mars, Venus, or an asteroid), and Ulysses  When Ulysses crossed the ecliptic twice per orbit, many GRB determinations lost accuracy 
Additional discoveries:
Data provided by Ulysses led to the discovery that the Sun's magnetic field interacts with the Solar System in a more complex fashion than previously assumed 
Data provided by Ulysses led to the discovery that dust coming into the Solar System from deep space was 30 times more abundant than previously expected 
In 2007–2008 data provided by Ulysses led to the determination that the magnetic field emanating from the Sun's poles is much weaker than previously observed 
That the solar wind has "grown progressively weaker during the mission and is currently at its weakest since the start of the Space Age" 

Fate
Ulysses will most likely continue in heliocentric orbit around the Sun indefinitely  However, there is a chance that in one of its re-encounters with Jupiter a close fly-by with one of the Jovian moons would be enough to alter its course and so the probe would enter a hyperbolic trajectory around the Sun and leave the Solar System 

See also
Advanced Composition Explorer – NASA satellite of the Explorer program
List of heliophysics missions
List of missions to the outer planets
Parker Solar Probe – NASA robotic space probe of the outer corona of the Sun
Solar and Heliospheric Observatory – European space observatory
STEREO – Solar observation mission (2006–present)
TRACE – NASA satellite of the Explorer program
WIND – NASA probe to study solar wind, at L1 since 1995
Solar Orbiter – European space-based solar observatory
Context 3: Passage 1:
Cheval de frise
The cheval de frise (plural: chevaux de frise [ʃə vo də fʁiz], "Frisian horses") was a defensive obstacle, existing in a number of forms, principally as a static anti-cavalry obstacle but also quickly movable to close breaches   The term was also applied to underwater constructions used to prevent the passage of ships or other vessels on rivers   In the anti-cavalry role the cheval de frise typically comprised a portable frame (sometimes just a simple log) with many projecting spikes   Wire obstacles ultimately made this type of device obsolete  
The invention of the cheval de frise is attributed to ancient China  The concept of using a defensive obstacle made of wooden or metal stakes predates its use in Europe  Historical records suggest that similar types of defensive barriers, known as "teng pai" or "mó pai", were used in China as early as the 4th century BC  These early versions of the cheval de frise were employed to protect cities, forts, and other strategic locations from enemy attacks 
The use of chevaux de frise spread to Europe during the Middle Ages and became a common feature of medieval fortifications  They were used extensively in castle defenses and military campaigns, particularly during the Renaissance and early modern periods  However, the original concept and early usage of the cheval de frise can be traced back to ancient China 
During the American Civil War the Confederates used them more than the Union forces  During World War I, armies used chevaux de frise to temporarily plug gaps in barbed wire  Barbed wire chevaux de frise were used in jungle fighting on the South Pacific islands during World War II 
The term is also applied to defensive works on buildings  This includes a series of closely set upright stones found outside the ramparts of Iron Age hillforts in northern Europe, or iron spikes outside homes in Charleston, South Carolina 

Etymology
In French, cheval de frise means "Frisian horse"  The Frisians fought predominantly using cavalry; they were known for being formidable horsemen, and Frisian horses were renowned for their strength and agility  Therefore, for defense they relied heavily on anti-cavalry obstacles  The Dutch also adopted the use of these defensive devices when at war with Spain  The term cheval de frise came to be used for any spiked obstacle, such as broken glass embedded in mortar at the top of a wall 
The cheval de frise was adopted in New York and Pennsylvania during the American Revolutionary War as a defensive measure installed on rivers to prevent upriver movement by enemy ships  During the Peninsular War, at the siege of Badajoz in 1812, a cheval de frise was successfully deployed to fill a breach in the town wall, allowing the French to inflict heavy casualties on the British storm troops 

American Revolutionary War
During the American Revolutionary War both Thaddeus Kosciuszko and Robert Erskine designed an anti-ship version of the cheval-de-frise to prevent British warships from proceeding up the Delaware River and Hudson River, respectively  A cheval de frise by Erskine's design was placed between Fort Washington at northern Manhattan and Fort Lee in New Jersey in 1776  The following year construction began on one to the north of West Point at Pollepel Island, but it was overshadowed by the completion of the Great Chain across the Hudson in 1778, which was used through 1782 

Similar devices planned by Ben Franklin and designed by Robert Smith were used in the Delaware River near Philadelphia, between Fort Mifflin and Fort Mercer  Two other lines of chevaux-de-frise were also placed across the Delaware River at Marcus Hook, Pennsylvania and Fort Billingsport, New Jersey as a first line of defense for Philadelphia against the British naval forces A cheval de frise was retrieved from the Delaware River in Philadelphia on November 13, 2007, in excellent condition, after more than two centuries in the river  In November 2012, a 29-foot (9 m) spike from a cheval-de-frise was recovered from Delaware off Bristol Township; it was also believed to be from the Revolutionary era installation at Philadelphia and freed up by Hurricane Sandy earlier that fall 

Legacy
A small promontory on the north-east Essex coast in the United Kingdom (UK), between Holland Haven and Frinton-on-Sea, was named Chevaux de Frise Point 

See also
Czech hedgehog
Passage 2:
Jacob Haish
Jacob Haish (March 9, 1826 – February 19, 1926) was one of the first inventors of barbed wire  His type of barbed wire was in direct competition with the other barbed wire manufacturers in DeKalb, Illinois  He was a known carpenter and architect in DeKalb County and designed several prominent DeKalb homes 

Early life
Haish was born in Baden, Germany on March 9, 1826, and immigrated with his family to the United States in 1835  He came to Illinois in 1845, married Sophie Ann Brown in 1847, and moved to DeKalb in 1853, where he was a carpenter  He cultivated osage orange hedges whose thorns made them effective as cattle fencing 

The birth of barbed wire
In late 1872, Henry Rose developed a wire fence with an attached wooden strip containing projecting wire points to dissuade encroaching livestock  He patented his fence in May 1873 and exhibited it at the DeKalb County Fair that summer  This prompted Haish and other DeKalb residents Isaac Ellwood and Joseph Glidden to work on improving the concept   Haish had patented three styles of barbed fencing by June 1874  When Haish's patent for an "S-barb" design was granted in August 1875, he launched a drawn out legal battle to stymie his rivals  It failed at the US Supreme Court in 1895 

Haish gifts a library
In 1893, the city council of DeKalb, Illinois, decreed the establishment of a public library   The impetus for this ordinance was requests from the Ladies of the Library Association, a group that had conducted a reading room for several years  The library moved twice before the Haish gift came along; it was first located on the second floor of the city hall and then, in 1923, moved to the second floor of the DeKalb Daily Chronicle building on Lincoln Highway 
Jacob Haish died at his home in DeKalb on February 19, 1926  He had bequested a $150,000 gift for a library building in his will  The result was the Haish Memorial Library in downtown DeKalb 

See also
George H  Gurler House
Joseph F  Glidden House
Passage 3:
Concertina wire
Concertina wire or Dannert wire is a type of barbed wire or razor wire that is formed in large coils which can be expanded like a concertina  In conjunction with plain barbed wire (and/or razor wire/tape) and steel pickets, it is most often used to form military-style wire obstacles  It is also used in non-military settings, such as when used in prison barriers, detention camps, riot control, or at international borders 
During World War I, soldiers manufactured concertina wire themselves, using ordinary barbed wire  Today, it is factory made 

Origins
In World War I, barbed wire obstacles were made by stretching lengths of barbed wire between stakes of wood or iron  At its simplest, such a barrier would resemble a fence as might be used for agricultural purposes  The double apron fence comprised a line of pickets with wires running diagonally down to points on the ground either side of the fence  Horizontal wires were attached to these diagonals More elaborate and formidable obstructions could be formed with multiple lines of stakes connected with wire running from side-to-side, back-to-front, and diagonally in many directions  Effective as these obstacles were, their construction took considerable time 
Barbed wire obstacles were vulnerable to being pushed about by artillery shells; in World War I, this frequently resulted in a mass of randomly entangled wires that could be even more daunting than a carefully constructed obstacle  Learning this lesson, World War I soldiers would deploy barbed wire in so-called concertinas that were relatively loose  Barbed wire concertinas could be prepared in the trenches and then deployed in no-man's-land relatively quickly under cover of darkness 

There was what might be called a concertina craze on: innumerable coils of barbed wire were converted into concertinas by the simple process of winding them round and round seven upright stakes in the ground; every new lap of wire was fastened to the one below it at every other stake by a twist of plain wire; the result, when you came to the end of a coil and lifted the whole up off the stakes was heavy ring of barbed wire that concertina'd out into ten-yard lengths  
Concertina wire packs flat for ease of transport and can then be deployed as an obstacle much more quickly than ordinary barbed wire, since the flattened coil of wire can easily be stretched out, forming an instant obstacle that will at least slow enemy passage  Several such coils with a few stakes to secure them in place are just as effective as an ordinary barbed wire fence, which must be built by driving stakes and running multiple wires between them 
A platoon of soldiers can deploy a single concertina fence at a rate of about a kilometer (5⁄8 mile) per hour  Such an obstacle is not very effective by itself (although it will still hinder an enemy advance under the guns of the defenders), and concertinas are normally built up into more elaborate patterns as time permits 
Today, concertina wire is factory made and is available in forms that can be deployed very rapidly from the back of a vehicle or trailer 

Dannert wire
Oil-tempered barbed wire was developed during World War I; it was much harder to cut than ordinary barbed wire  During the 1930s, German Horst Dannert developed concertina wire of this high-grade steel wire  The result was entirely self-supporting; it did not require any vertical posts  An individual Dannert wire concertina could be compressed into a compact coil that could be carried by one man and then stretched out along its axis to make a barrier 50 feet (15 m) long and each coil could be held in place with just three staples hammered into the ground Dannert wire was imported into Britain from Germany before World War II  During the invasion crisis of 1940–1941, the demand for Dannert wire was so great that some was produced with low manganese steel wire which was easier to cut  This material was known as "Yellow Dannert" after the identifying yellow paint on the concertina handles  To compensate for the reduced effectiveness of Yellow Dannert, an extra supply of pickets were issued in lieu of screw pickets 

Triple concertina wire
A barrier known as a triple concertina wire fence consists of two parallel concertinas joined by twists of wire and topped by a third concertina similarly attached  The result is an extremely effective barrier with many of the desirable properties of a random entanglement  A triple concertina fence could be deployed very quickly: it is possible for a party of five men to deploy 50 yards (46 m) of triple concertina fence in just 15 minutes  Optionally, triple concertina fence could be strengthened with uprights, but this increases the construction time significantly 

"Constantine" wire
Concertina wire is sometimes mistakenly called "constantine" wire   Constantine probably came from a corruption/misunderstanding of concertina and led to confusion with the Roman Emperor Constantine  This, in turn, has led to some people trying to differentiate between concertina wire and constantine wire by assigning the term constantine wire to what is commonly known as razor wire  In contrast to the helical construction of concertina wire, razor wire, or less commonly, constantine wire, consists of a single wire with teeth that project periodically along its length 

See also
Barbed tape
Slinky
Passage 4:
Wire obstacle
In the military science of fortification, wire obstacles are defensive obstacles made from barbed wire, barbed tape or concertina wire  They are designed to disrupt, delay and generally slow down an attacking enemy  During the time that the attackers are slowed by the wire obstacle (or possibly deliberately channelled into killing zones, or both) they are easy to target with machine gun and artillery fire  Depending on the requirements and available resources, wire obstacles may range from a simple barbed wire fence in front of a defensive position, to elaborate patterns of fences, concertinas, "dragon's teeth" (which serve a similar purpose as wire obstacles, but for combat vehicles instead) and minefields (both anti-personnel and anti-armor) hundreds of metres thick 
One example is "low wire entanglement", which consists of irregularly placed stakes that have been driven into the ground with only some 15 cm (six inches) showing  The barbed wire is then wrapped and tightened on to these  An enemy combatant running through the barrier, which is difficult to see, is apt to trip and get caught 

History
Wire obstacles were used by Union Army general Ambrose Burnside during the Battle of Fort Sanders in the Knoxville campaign of the American Civil War, when telegraph wire was strung between tree stumps 30 to 80 yards in front of one part of the Union line  The Royal Danish Army also used wire fences in front of its Danevirke fortifications during the Second Schleswig War  They first saw significant military use by British forces during the Second Boer War, and reached the pinnacle of visibility during World War I where they indirectly, together with machine guns, were responsible for many (although not the majority of) casualties in the trench warfare that dominated that conflict  Wire obstacles served to magnify the substantial advantage that the repeating rifle and rapid-firing artillery, along with machine guns, had given to the defending side in the new era of warfare 
World War I entanglements could in some places be tens of metres thick and several metres deep, with the entire space filled with a random, tangled mass of barbed wire  Entanglements were often not created deliberately, but by pushing together the mess of wire formed when conventional barbed wire fences had been damaged by artillery shells  Whenever there was time and opportunity to plan and emplace wire obstacles during World War I, it was standard practice to deploy designs that would channel and concentrate attacking troops, through avenues of approach, herding them like cattle into designated killing zones i e  fixing multiple screw pickets of wire running diagonally, away from the protected zone  This meant that a belt-fed machine-gun such as the Maschinengewehr 08 sited along that diagonal line had easy targets to enfilade when attacking troops were blocked from advancing by the wire and then massed together in a line 
Another method was to deliberately leave attractive-looking gaps in wire obstacles to give the appearance of a weak link in the defences  Such gaps were designed to act like a funnel, luring attacking troops through the opening and straight into the concentrated direct and enfilade fire of different machine gun emplacements  Because multiple water-cooled machine-guns such as the Vickers gun were used, continuous fire could be sustained for hours at a time if required  Methods for soldiers to face this threat were a small wheeled steel plate that was slowly pushed forward in front of the soldier to shield them from bullet fire as they crawled, shielded machine gun carts, the MacAdam Shield Shovel or systems like the mobile personnel shield among others  When the obstacle was reached, access holes in the shield allowed the attacking soldier to cut away at the wire obstacle with pliers from behind the protection of the armored shield Stormtrooper platoons included ballistic shields in their equipment list, as infiltration was one of their specialities  Relatively elaborate obstacles were also used in some phases of the Korean War, and continue to be used on the Korean Demilitarized Zone, and a few other borders  However the more fluid nature of modern war means that most obstacles used today are relatively simple, temporary barriers  Tanks and light armored vehicles can generally flatten unmined wire obstacles, although the wire can become entangled in the tracks and immobilize the vehicle  This can also occur to wheeled vehicles once the wire becomes wrapped around the axle   Wire obstacles can also be breached by intense artillery shelling or Bangalore torpedoes 

Enhanced effectiveness
The effectiveness of any wire obstacle is greatly increased by planting anti-tank and blast antipersonnel mines in and around it  Additionally, connecting bounding anti-personnel mines (e g  the PROM-1) to the obstacle with tripwires has the effect of booby-trapping the obstacle itself, hindering attempts to clear it  Dummy tripwires can be added to cause further confusion  If anti-personnel mines are unavailable, it is very easy to connect hand-grenades to the wire using trip-wires  If the use of lethal explosive devices is deemed to be unsuitable, it is easy to emplace tripflares in and around the wire obstacle in order to make night-time infiltration harder 

Gallery
Passage 5:
The Barbed Wire Patent
The Barbed Wire Patent Case, 143 U S  275 was a significant patent dispute in 1892 between plaintiff Joseph Glidden and the USPTO regarding the right of barbed wire   Lucian Smith was the original inventor in 1867 and held patent rights for it, while Glidden made changes to the production of barbed wire, holding the barbs in place, in 1874 that he believed were novel enough to merit a new invention and thus new patent 

Background
Lucien B  Smith had first invented a basic form of barbed wire in 1867 and received the patent for it   Therefore, at the time he had exclusive rights to produce and sell his product   In 1874, after Glidden made his changes, he was issued a statement denying him a new patent on the grounds that his invention simply was not a novelty   His patent claim was for:

"a twisted fence wire having the transverse spur wire, D, bent at its middle portion about one of the wire strands, a, of said fence wire, and clamped in position and place by the other wire strand, z, twisted upon its fellow, substantially as specified "The Patenting and Trademark office denied his application believing that the process was already widely known common knowledge and not novel enough to be distinguished from earlier patents After Glidden's patent application had been denied, he appealed to the decision and eventually the case went before the Supreme Court 

Case
In the eyes of the court, the question of most importance was whether the invention of Glidden was sufficient in novelty   To answer this they considered for some length the process for producing barbed wire prior to this invention and compared it to Glidden's design  Glidden claimed that his process of adding an extra wire to stabilize the barbs without any other means made them sufficiently stronger and more efficient  However, he apparently did not make this clear until his initial patent application was denied and he had applied for reissue  Therefore, the court ignored this feature at first  Glidden stated:

"I do not claim to have originated the devices known as 'spurs' or 'prongs' on the wires, they having been used before, but confine myself to the means for holding the spurs at proper intervals on the wires and to the means for attaining a uniform tension of the wires, as claimed "The court remarked that a new device phasing out an older version does not necessarily merit the awarding of a new patent, but it may merit consideration  The court took into account that Glidden's invention had widely replaced older versions and was now commonly in use The defense attempted to show that others had made the same design independently before Glidden, but the plaintiff was able to assert that indeed the other productions, which were of virtually similar design, were not made until after he issued his patent  The court agreed that there had been plenty of other attempts to create a similar design and product as Glidden, but none had been successful nor had they been successfully patented 

Decision
The circuit court finally decided to reverse the decision of the lower court and ruled in favor of the plaintiff, Joseph Glidden   The majority of the court was convinced that Glidden's invention proved to have enough novelty and technological change to merit the patent and thus exclusive rights to produce and sell the improved barbed wire without the need for licensing   Much of this decision came from the court's inclination to grant a patent to the final step in turning an invention into a useful or more useful product 

Dissent
Justice Field was the sole dissenting opinion  He disagreed with the decision on the grounds that he believed there was no true novelty to Glidden's decision and thus lacked sufficient reasoning to receive a patent 

Significance
This case largely established precedent for future patent law, specifically in questions of first-to-file, or scope of novelty   The first-to-file aspect was largely supported in that whichever party can prove they filed an invention first will have a greater claim over other manufacturers and better their chances of receiving a patent   Secondly, the scope of novelty was determined to not be some significant change, but simply enough to make a noticeable positive difference   Also success of a minor innovation is for grounds for patenting in light of the numerous failed or discontinued minor innovations pursued Glidden held sole rights to sell the product and thus established the Barb Fence Company, in Dekalb, Illinois   The invention made him extremely wealthy and by the time of his death he was one of the richest men in the United States 
Passage 6:
Joseph F  Glidden House
The Joseph F  Glidden House is located in the United States in the DeKalb County, Illinois city of DeKalb  It was the home to the famed inventor of barbed wire Joseph Glidden  The barn, still located on the property near several commercial buildings, is said to be where Glidden perfected his improved version of barbed wire which would eventually transform him into a successful entrepreneur  The Glidden House was added to the National Register of Historic Places in 1973  The home was designed by another barbed wire patent holder in DeKalb, Jacob Haish 
The property contains the house and two outbuildings; the barn and the remains of an old windmill foundation  Constructed in 1861, the Glidden House adheres mostly to a French Colonial style of architecture  The raised basement and full-length porch are two of the architectural elements found on the Glidden House that are consistently found in French Colonial homes  The barn, a building of high historical significance, was not included as part of the National Register listing for the property until 2002, nearly 30 years after the original nomination was approved 

House
The land that the Glidden House stands on is what remains of Joseph Glidden's once large DeKalb County farm  His holdings stretched along Lincoln Highway, both the north and south sides, from the Kishwaukee River in the east to present-day Annie Glidden Road on the west  The Glidden Farm went as far north as today's Lucinda Avenue  The farm's south border, near where Glidden would grant the Galena and Chicago Union Railroad right-of-way through DeKalb in the early 1890s was near present-day Taylor Street The two-story Joseph F  Glidden House is constructed from locally fired brick, which is relatively soft  The softness of the brick has caused it to weather in a non-uniform fashion  The brick is said to have been fired at a small brickyard which once existed on the Kishwaukee River in DeKalb, near the present-day Lincoln Highway bridge  The home stands on a stone foundation and was designed by local carpenter and eventual barbed wire competitor to Glidden, Jacob Haish  Construction was completed in 1861 and the home is a prominent example of Illinois French Colonial architecture 

History
The land where the Glidden House stands once held a log structure, which Glidden lived in when he first came to DeKalb at the beckoning of his cousin Russell Huntley  The house was built in 1861 for barbed wire entrepreneur Joseph Farwell Glidden  As his personal residence, the house, and its accompanying barn, were closely associated with his invention, really just an improvement, of barbed wire  Glidden's improvement upon a wire board fence developed by Henry Rose was of vast importance in the settlement of the United States west of the Mississippi  It was after Glidden saw Rose exhibit his wire at a fair in 1873 that he was struck with the idea of attaching barbs to wire strand fencing  Glidden is said to have experimented with some of his ideas in the basement kitchen of the Glidden House  He noticed that whenever he tried to attach barbs directly to strands of wire they slid along the length of the wire; Glidden realized he needed a way to crimp the barbs  He began tinkering around the home's kitchen  Glidden fit two hair pins to the shaft of a coffee mill, one centered and the other off-center  He found that by placing the wire between the pins and turning the crank a uniform barb resulted  How to crimp the barbs to the wire was solved, in the barn, by tying one end of the wire and another length of wire to a poplar tree on the grounds of the Glidden House and the other ends of the wires to a grindstone  The grindstone was used to twist the wires together and prevent the barbs from slipping Day-to-day life at the Glidden House was mostly carried out in the home's basement which contained a full kitchen, dining room, and living room  The upper floors were used for guests and for sleeping quarters  In 1877 Glidden's daughter, Elva, married William H  Bush in the homestead As of 2006 extensive restoration work had been completed on the home



ground_truth: Sun

prompt_front: Answer the question based on the given passages. Only give me the answer and do not output any other words.

Question: When was the plaintiff in the 1892 Barbed Wire Patent Case born?

The following are given passages.
Context 3:  The front porch was repaired and restored and inside, the hardwood floors have been replaced and refinished  In addition, the front parlors have been repainted and restored 

Architecture
The home was mostly designed in a French Colonial style, though it contains some elements of Greek Revival architecture  French Colonial architecture was more popular in the American South than it ever was in the northern tier of states 

Exterior
The two-story brick structure is supported by a fieldstone foundation and still features its original front porch  The porch spans the length of the building's front (south) facade, at a height of about 6 ft (2 m)  The porch is supported by four wooden pillars, which rest on stone bases  The stairs leading to the front porch are supported by two similar wooden posts, which, like the house, are set into fieldstone bases  The first step on the stairs was originally a limestone block embedded in the ground  The porch roof is supported by six wooden, bracketed pillars  The pillars are simple, with the brackets coming from the boxed capitals  At the rear of the porch wooden pilasters set at each end help to support the roof  Differentiating the home from the traditional French Colonial design is the porch roof, which is separate from the main roof The house stands mostly as it did in 1861 save a few alterations  The front porch was screened in at the time the building was added to the National Register of Historic Places, the screens have since been removed  At the rear of the house a small porch was enclosed  In 1909 or 1910 there were major subtractions and replacements  Removed were a cast-iron widow's walk along the roof ridge and a large gable dormer, decorated in the same manner as the cornice decorating the roof trim  The present dormer replaced the larger one and is more of a low-shed type 
The roof itself is a low gable and dominated by single stack, straddle ridge chimneys at its east and west ends  The boxed roof trim is a decorated cornice  The low-shed dormer is covered with green asphalt  The old widow's walk, which a neighbor dubbed Glidden's "obscuratory", was balustraded and set just above the dormer 

Interior
The interior of the building is also similar to how it appeared when the house was constructed  However, a few changes have been made  In 1910 the two marble fireplaces were replaced by brick  The flooring has been replaced as needed  The home's basement, once the main living area, has since been converted several times for other uses On the first floor of the home the rooms remain much the same as they were when Glidden lived in the house  An original multi-paneled wooden door remains at the entry from the porch to the central hall  The door, however, was altered, having glass panels installed to admit more light  The staircase is also original and its newel posts resemble those found in the Isaac and Harriet Ellwood House, another Haish designed home, and the Gurler House, whose architect is unknown though it was quite possibly Haish, both in DeKalb On the house's east side are three rooms, whose original presence is open to debate  The three rooms are interconnected, another common French colonial element  The room adjacent the porch was used as the Glidden's dining room and is where the large brick fireplace, which replaced the marble one in 1909, is located  The 1909 fireplace is of the American Craftsman style  At the end of the hall, near the kitchen, there is a full bathroom 
The western part of the first floor is dominated by a large formal living room  The room has two entrances, one at the front of the hall, near the front door and the other at the back end of the hall  This was the room in which Elva Glidden married in the late 19th century  After 1941 the rear part of the living room, or "west" room, was walled off and a second kitchen added  When Jessie Glidden, the last Glidden to occupy the old homestead, moved in 1998, the west room was restored to its original size and the second kitchen removed The basement, and for part of the home's history, the main living area, is accessed via a staircase at the back of the first-floor hall  The steep stairs still show years of wear  One of the rooms off the main basement is the kitchen where Glidden is said to have experimented with the coffee grinder and his wife's hair pins, eventually leading to his brand of barbed wire The second-floor served as the main sleeping quarters  It consists of a few simple bedrooms, all historically without closets  The upstairs hall contains a door which once accessed a staircase to the widow's walk, what remains of the space has been used as a closet for over a century 

Outbuildings
The property has two remaining outbuildings  The barn is where Glidden invented his famous improvement on barbed wire  Dubbed "The Winner," his barbed wire became the most popular version of the invention  Barbed wire is considered to be one of the most important factors in American progress and settlement The other outbuilding on the property along historic Lincoln Highway are the remnants of a once dominating windmill  Though only the foundation remains, it gives a glimpse of how impressive the structure must have once been 

Barn
The Glidden Barn, located to the rear and east of the home, was thought to have been added to the National Register of Historic Places when the original nomination for the house was approved in 1973  However, in the late 1990s, the Illinois Historic Preservation Agency revealed that the nomination included only the house  The Glidden Historical Center initiated the process of adding the barn to the Register  Those moves were approved by the Illinois Historic Sites Advisory Council in 2002 and the barn officially became part of the National Register 
The barn was built sometime around 1871, possibly even before, and is constructed of the same soft brick that makes up the exterior of the home  Tradition in the Glidden family holds that the barn, like the house itself, was designed and built by prominent local carpenter Jacob Haish  The famous barn, one of DeKalb County's oldest remaining, stands a full two-stories high, measuring around 50 feet (15 m) tall, with a width of 30 feet (9 m) 
In February 2007 the Glidden Homestead and Historical Center kicked off a fundraising drive  The drive is aimed at raising US$2 million to expand the Joseph F  Glidden House site to include museum space and a media center  Some of the funds will be used to help restore the barn and expand historical center museum space into the building 

Architecture
The Glidden barn is of pole and beam construction  The second-floor interior is dominated by two large transverse wooden beams  It is of the three-bay, English tradition, the west bay containing a space for a stairwell leading to a hayloft and seven stalls  It is constructed of red brick and stands on a foundation of limestone  Glidden's barn took full advantage of the term vernacular; the brick was locally manufactured and the limestone locally quarried 
The east bay of the barn contains an animal stall in its northeast corner and a fully enclosed office in its opposite corner  The second-floor hayloft is supported by the two massive transverse beams  The full-sized loft is accessible via an enclosed staircase against the south wall  The building's exterior roof is fully supported by the brick walls  The result is a loft which is an entirely open space save for some pole and beam construction supporting the laminated beams, which act as tie rods at the base of the roof  The barn roof is a common gable roof pitched at a 45 degree angle, it was originally covered with wooden shingles, those have been replaced over the years with asphalt The barn features extensive windows, somewhat unusual outside of dairy barns, with a total of 14 eight-paned, double-hung windows dispersed over three sides of the rectangular structure, north, south and east  On the west side, facing the house, are seven smaller single-pane windows  The double-hung windows are topped with segmented arches constructed from a double row of bricks; the north and south main entrances are also topped with segmented brick arches, each of three rows of bricks 

Windmill building
Only the foundation remains of the property's windmill  What is left, ten rows of stone above the ground, is completely invisible when the home is viewed by passers-by on Lincoln Highway  The windmill started to fall into disrepair around the 1930s or 40s  The original, specific use of the windmill is unknown 

See also
Isaac Ellwood
List of Registered Historic Places in Illinois
Passage 7:
Devils Rope Barbed Wire Museum
The Devils Rope Barbed Wire Museum is a museum located in McLean, Texas, United States  The museum was officially opened in 1991 and  focuses on barbed wire and its history  The museum is thought to have the largest collection of published material concerning barbed wire The Devil's Rope Museum is housed in a converted brassiere factory and is dedicated to the history of barbed wire, fencing tools, and ranching heritage  Features exhibits and collections from private wire collectors from across the U S, a reference library with extensive patent information for researchers and educators, a Dust Bowl exhibit, salesman samples, warfare wire, and a collection of road lore with artifacts dedicated to the Texas portion of Historic Route 66 
Passage 8:
Kansas Barbed Wire Museum
The Kansas Barbed Wire Museum is a barbed wire museum located in La Crosse, Kansas, United States, known as the “Barbed Wire Capital of the World ” The museum focuses on barbed wire and its history, displaying over 2,000 different forms of the wire and its history  Barbed wire played a significant role in the history of the settlement of the United States and forever changed the face of the prairie 
The museum was established in 1970 in a small storefront on Main Street in downtown La Crosse, Kansas  By 1990, the collections had grown so much that a new building was constructed adjacent to the Post Rock Museum and Rush County Historical Museum in Grass Park at the south edge of the community  In 2004, an addition was constructed on the building to house the headquarters of the Antique Barbed Wire Society and the Larry Greer Research Center  The Antique Barbed Wire Society is an international organization “committed to collecting, preserving, exhibiting, and interpreting the historical heritage of barb wire and barbed wire related items ” The Larry Greer Research Center houses collections of publications related to the history of barbed wire and a complete collection of patents related to barbed wire and related items  The Kansas Barbed Wire Museum is located at 120 W  1st Street, La Crosse, KS 67548 
Passage 9:
Joseph Glidden
Joseph Farwell Glidden (January 18, 1813 – October 9, 1906) was an American businessman and farmer  He was the inventor of the modern barbed wire  In 1898, he donated land for the Northern Illinois State Normal School in DeKalb, Illinois, which was renamed as Northern Illinois University in 1957 

Early life
Glidden was born in Charlestown, New Hampshire, of English descent  His family later moved to Clarendon, New York  Glidden was a teacher there for about 8 years, during which years he married Clarissa Foster in 1837  In 1843, he moved to Illinois with his wife and children, first to Ogle County and then to DeKalb where they had purchased a farm  His wife died in 1846, in childbirth of their daughter in Ogle County, Illinois  Their three children, including the infant daughter Clara (Clarissa) died in an epidemic in 1847  Their two sons died after the move  Glidden married Lucinda Warne in 1851, with whom he had one daughter, Elva Frances 

Invention and patent for barbed wire
Glidden began work on ways to make a useful barbed wire to fence cattle in 1873  He made his best design of barbed wire by using a coffee mill to create the barbs  Glidden placed the barbs along a wire and then twisted another wire around it to keep the barbs in place, in a design that he called “The Winner”, being his best design  He received the patent for that barbed wire design on November 24, 1874, when he was 61 years old  He and local hardware dealer Isaac L  Ellwood began manufacturing and selling the barbed wire with his patent, as the Barb Fence Company in DeKalb, Illinois  In 1876, Glidden exited the manufacturing aspect, though retaining royalties, by selling his half of the manufacturing business to Washburn and Moen, who had a wire manufacturing plant in Worcester, Massachusetts and from whom Glidden and Ellwood had been purchasing steel wire   Ellwood stayed in DeKalb and renamed the company I  L  Ellwood & Company of DeKalb  That company evolved into American Steel and Wire, and eventually was bought by U  S  Steel Manufacturing Company 
Glidden was embroiled in a legal battle initiated by fellow DeKalb resident Jacob Haish over whether the design for holding the barbs in place with an extra strand of wire was novel, an improved design  An earlier patent for barbed wire had been issued to a man in Ohio, among other patents related to barbed wire  Glidden eventually won at the US Supreme Court in an 1892 case, his patent protection expired the same year  The legal fees were estimated to have cost Glidden $100,000 
This invention made him extremely rich  It was estimated that Glidden earned $1,000,000 in royalties until his patent expired in 1892  Companies manufacturing the barbed wire under his license ranged from New York state to Kansas by 1884  By the time of his death in 1906, he was one of the richest men in America  The Dun & Bradstreet Collection, 1840–1895, MSS 791, LXIII, 130, Baker Library, Harvard, recorded his assets at one million dollars  This included the Glidden House Hotel; the DeKalb Chronicle; 3,000 acres (12 km2) of farmland in Illinois; 35,000 acres (1,360 km2) in Texas; and the Glidden Felt Pad Industry 

Local political activity and other businesses
From 1852 to 1854, he served as sheriff of DeKalb County  In 1851, 1861, 1862, 1869, 1870, 1871, 1872, and 1876 he served on the county's board of supervisors  In 1867, he served on the executive committee of DeKalb County Agriculture and Mechanical Society's Seventh Annual Fall Fair, held September 25–28  In 1876, he was the Democratic nominee for Illinois State Senator  From 1861 to 1874, he served as a member of the board of school directors, and for 20 years paid the largest school tax of any citizen of the county  He was also one of the largest contributors to the erection of one of the churches  He was also vice-president of the DeKalb National Bank, director of the North Western Railroad, and owner of the DeKalb Rolling Mill 

Demonstration of use in Texas changes ranching
To demonstrate the effectiveness of barbed wire, Glidden and his sales agent for the State of Texas, Marques Fortner, in 1881 developed the "Frying Pan Ranch" in Bushland in Potter County near Amarillo, Texas  The wire was brought in by wagon from the railhead at Dodge City, Kansas, and the timbers were cut from Palo Duro Canyon and along the Canadian River Valley  A herd of 12,000 head of cattle was branded with the "Panhandle Brand", which the cowboys called " frying pan"  The ranch proved the success of the wire and changed ranching Henry B  Sanborn, a sales representative for Glidden's company, owned a ranch in Grayson County north of Dallas and wished to advertise barbed wire there  In 1881, Sanborn purchased ninety-five sections of land in southwestern Potter County from near the Canadian River extending into Randall County south of Amarillo  Included in the purchase was Tecovas Spring, once a watering site and a trading post for Indians and Comancheros  John Summerfield, a surveyor from Sherman, Texas, reported a constant flow of freshwater from the spring  Sanborn chose this site for his ranch headquarters and enclosed 120 miles of land in barbed wire for $39,000 ($1 18 million in 2022 dollars)  Warren W  Wetzel, also of Sherman, used cedar posts brought from both the Palo Duro Canyon and the breaks of the Sierrita de la Cruz in the northwestern portion of the ranch to hold up the wire Besides ranchers, railroads were large purchasers of barbed wire, so that cattle did not stray onto their tracks  The Frying Pan Ranch soon had 15,000 head of cattle, and 125,000 more acres were added  Later the ranch was divided  In 1898, Glidden deeded Frying Pan Ranch to his son-in-law William Henry Bush  Between 1908 and 1920, William Henry Bush and his second wife Ruth Bush built a larger ranch house near Tecovas Spring, which later became the residence of Stanley Marsh 3 and his wife, Wendy  Gwendolyn “Wendy” Bush O’Brien was the daughter of Emeline Bush and her husband Frank O’Brien; Emeline was a daughter of William Henry and Ruth Bush  Stanley Marsh called the estate “Toad Hall ”

Land for the Northern Illinois State Normal School
Glidden, a former teacher, gave 63 acres (255,000 m2) of his homestead as a site for the Northern Illinois State Normal School  The school opened on September 12, 1898, with 139 students and 16 members of the faculty  The school's name was changed to Northern Illinois University in 1957 
The town of Glidden, Iowa, is named in his honor 

Personal life
He and his wife Lucinda had one daughter, Elva Frances, in 1851  She married William Henry Bush in DeKalb on February 1, 1877  His wife Lucinda died on October 28, 1895 Elva died in 1906 not long before her father died, and is buried in the Glidden family plot in a cemetery in DeKalb 
In 1898, Glidden deeded his Frying Pan ranch in Texas to his son-in-law, W  H  Bush  Bush married again in 1908, after being widowed, to Ruth Russell Gentry  He is buried in Graceland Cemetery in Chicago 

In popular culture
The "barbed wire salesman" in Back to the Future Part III is either based on Joseph F  Glidden or John Warne Gates who was a pioneer promoter of barbed wire  He is played by Richard Dysart 

See also
Joseph F  Glidden House
The Barbed Wire Patent

Patents
U S  Patent 157,124 – Wire fences
Passage 10:
Hanging on the Old Barbed Wire
"Hanging on the Old Barbed Wire" (Roud 9618) is a British war song of World War I   The song sarcastically recounts the location of various army members, not to be found in the combat zone, and concludes by describing the location of the old battalion: "hanging on the old barbed wire"  A barbed wire fence separated the front-line trench from no man's land, and men brave or unfortunate enough to go over the top of the dug-out were often quickly shot and their bodies caught in the barbed wire  This troop song was not popular with officers, who thought it bad for morale, though attempts to suppress it were unsuccessful 

Lyrics
There are several different versions of this song, though all share the final two lines  One version:

A variant last line is "if you want to find the privates" Another variation fourth verse sees C O replaced with colonel, put at the start and, "He's On another 7 days leave" 

Covers
The song was included on the 1988 album English Rebel Songs 1381–1914 by the English anarchist punk band Chumbawamba, as well as on their 2003 re-recording of the same album (English Rebel Songs 1381–1984) 
A shortened version of the song was also included on the 2018 album The Blind Leading the Blind by the Ukrainian metal band 1914 as an interlude  The band's songs are all related to WWI events 
The song was covered by death industrial band Maruta Kommand on their 2000 album "Holocaust Rites" 
The song is part of the "Great War Trilogy" (The Valley of the Shadow / The Old Barbed Wire / Long, Long Trail) sung by John Roberts and Tony Barrand in their album,   A Present from the Gentlemen: A Pandora's Box of English Folk Songs (Golden Hind Music, GHM-101, 1992) 



ground_truth: January 18, 1813