The galaxy has two satellite galaxies, NGC 4323 connected with M100 by a bridge of luminous matter and NGC 4328.
Messier 100 is considered a starburst galaxy with a radius of 1 kilo-parsec, where star formation has been taking place for least 500 million years in separate bursts. Star formation is concentrated in a ring actually two tightly wound spiral arms attached to a small nuclear bar.
As usual on spiral galaxies of the Virgo Cluster, in the rest of the disk both star formation and neutral hydrogen are reduced in the galaxy's disk, something caused by interactions in the Virgo cluster.
Other Grand design spiral galaxies
Akari (satellite)
The launch was a project of the Institute of Space and Astronautical Science and the Japan Aerospace Exploration Agency (JAXA).
The satellite was launched on February 22, 2006.
The primary mission of "Akari" was as a space observatory to survey the entire sky in near-, mid- and far-infrared with its infrared telescope.
Walkie-talkie
A walkie-talkie is a hand held device, two way radio receiver/transmitter. It was developed in the second world war.
Radio engineer Alfred J. Gross worked on the early technology behind the walkie-talkie between 1934 and 1941. During the war it was developed by Donald L. Hings and engineering teams at Motorola led by Henryk Magnuski.
Typical walkie-talkies today are phone sized and have a push to talk button. Walkie-talkie are used for various reasons, in the military, for amateur radio, and for personal use.
The first walkie-talkie was so large it had to be carried in a backpack, and was called Motorola SCR-300. Mortorola also made other Walkie-talkies during World War Two. During World War Two The first hand-held Walkie-talkies were also developed by Mortorola during WWII.
The idea of walkie-talkies did not get much interest until the war started in 1939. After a few years the Motorola team had improved them, so that the army could use them. There were also vehicle and tank versions. The British, Germans and Americans all had their own versions.
Motorola also produced the hand-held radio during World War II, and it was called the "handie-talkie" (HT). The terms are often confused today, but the original walkie talkie referred to the back mounted model, while the handie-talkie was the device which could be held entirely in the hand (but had vastly reduced range).
Walkie-talkies are widely used in many settings, business, police force, military and recreation.
Abell 2142
Abell 2142 is a huge, X-ray luminous galaxy cluster in the constellation Corona Borealis. It is the result of an ongoing merger between two galaxy clusters. The combined cluster is six million light years across, contains hundreds of galaxies and "enough gas to make a thousand more". It is "one of the most massive objects in the universe".
The image on the right was taken in 1999 with the Chandra X-ray Observatory's 0.3-10.0 keV Advanced Imaging Spectrometer, and covers an area of 7.5 x 7.2 arc minutes. It shows a colossal cosmic "weather system" produced by the collision of two giant clusters of galaxies. For the first time, the pressure fronts in the system have been traced in detai. They show a bright, but relatively cool 50 million degree Celsius central region (white) embedded in large elongated cloud of 70 million degree Celsius gas (magenta), all of which is boiling in a faint "atmosphere" of 100 million degree Celsius gas (faint magenta and dark blue). The bright source in the upper left is an active galaxy in the cluster.
Abell 2142 is part of the Abell catalogue of rich clusters of galaxies originally published by UCLA astronomer George O. Abell (19271983) in 1958. It has a heliocentric redshift of 0.0909 (meaning it is moving away from us at 27,250 km/s) and a visual magnitude of 16.0. It is about 1.2 billion light years (380 megaparsecs) away.
Screen printing
Screen printing is a printing technique. It uses a woven mesh to support an ink-blocking stencil. The attached stencil has open areas of mesh that transfer ink or other printable materials. The ink or paint can be pressed through the mesh as a sharp image onto a material.
A fill blade or squeegee is moved across the screen stencil, forcing ink through the mesh openings.
Julianne Hough
Julianne Alexandra Hough (born July 20 1988) is an American dancer, country music singer and actress. She is best known for being a two-time champion on the ABC series "Dancing with the Stars". Her first album was released May 20, 2008. She acted in the 2011 remake of the movie "Footloose".
Hough is the second of five children. She has three sisters and a brother. All of her grandparents were professional dancers.
Jake Kaminski
Jake Kaminski (born August 11, 1988) is an American archer. He is best known for competing in the Summer Olympic Games.
At the 2012 Summer Olympics, he was part of the men's archery team that won a silver medal.
Brady Ellison
Brady Ellison (born October 27, 1988) is an American athlete. He is an archer who competed in the Summer Olympic Games.
At the 2012 Summer Olympics, he was part of the men's archery team that won a silver medal.
Crystal Bowersox
Crystal Lynn Bowersox (Born August 4, 1985, in Elliston, Ohio) is an American singer-songwriter and actress. She was the runner-up in the ninth season of "American Idol". Her debut album was "Farmer's Daughter", released in 2010. She was diagnosed with diabetes when she was age 6 and has been hospitalized several times since.
Kyoko Yano
Yano was born in Yokohama on June 3, 1984. After graduating from Kanagawa University, she joined Urawa Reds in 2007. In 2007 season, she was selected Best Young Player awards. She retired end of 2012 season. In 6 seasons, she played 111 matches in Nadeshiko League and she was selected Best Eleven every season.
In June 2003, Yano was a Kanagawa University student, she was selected to play for the Japan national team at the 2003 AFC Championship. At this competition, on June 11, she debuted and scored a goal against Guam. She played at the World Cup 3 times (2003, 2007 and 2011) and at the Summer Olympics 3 times (2004, 2008 and 2012). Japan won the championship at the 2011 World Cup and silver medal at the 2012 Summer Olympics. She played 74 games and scored 1 goals for Japan until 2012.
David Brown
David Brown (July 28, 1916 – February 1, 2010) was an American movie producer. Brown and business partner Richard D. Zanuck were one of the most successful producers in Hollywood in the 1960s and in the 1970s.
Brown was born in New York City, the son of Lillian (née Baren) and Edward Fisher Brown. He was best known as the producing partner of Richard D. Zanuck. They were jointly awarded the Irving G. Thalberg Memorial Award by the Academy of Motion Picture Arts and Sciences in 1990 for their achievements in producing. Among their films were Steven Spielberg's "Jaws" (1975), and other box office hits such as "Cocoon" (1985), "Driving Miss Daisy" (1989) and "A Few Good Men" (1992).
Brown had one son (Bruce, from an earlier marriage) who died before him, and a half brother (Edward Fisher Brown Jr.).
Brown authored "Brown's Guide to the Good Life: Tears, Fears, and Boredom", which gives advice on life. He also wrote "Let Me Entertain You", an anecdotal auto-biography.
Brown died at his home in Manhattan from renal failure on February 1, 2010, at the age of 93.
Helen Gurley Brown
Helen Gurley Brown (February 18, 1922 – August 13, 2012) was an American author, publisher, and businesswoman. She was editor-in-chief of "Cosmopolitan" magazine for 32 years.
Brown was born in Green Forest, Arkansas on February 18, 1922, the daughter of Cleo and Ira Marvin Gurley.