[DOC] [TLE] Sputnik 1 - Wikipedia [PAR] Sputnik 1 was the first artificial Earth satellite. The Soviet Union launched it into 
an elliptical low Earth orbit on 4 October 1957. It was a 58 cm (23 in) diameter 
polished metal sphere, with four external radio antennae to broadcast radio 
pulses. It was visible all around the Earth and its radio pulses were detectable. .... 
Fearing the U.S. would launch a satellite before the USSR, OKB-1 suggested... [DOC] [TLE] Explorer 1 - Wikipedia [PAR] Explorer 1 was the first satellite of the United States, launched as part of its 
participation in the International Geophysical Year. The mission followed the first 
two satellites the previous year; the Soviet ... The U.S. Navy's attempt to put the 
first U.S. satellite into orbit failed with the launch of the Vanguard TV3 on 
December 6,... [DOC] [TLE] Space Race - Wikipedia [PAR] The competition began on August 2, 1955, when the Soviet Union responded to 
the US announcement four days earlier of intent to launch artificial satellites for... [DOC] [TLE] Sputnik 2 - Wikipedia [PAR] Sputnik 2 or Prosteyshiy Sputnik 2 was the second spacecraft launched into 
Earth orbit, on 3 November 1957, and the first to carry a living ... Sputnik 2 was 
launched into space only 32 days after its predecessor Sputnik 1. ... 3 to be 
finished was largely motivated by the desire the launch a satellite to orbit before 
the US. [DOC] [TLE] Sputnik - NASA History Homepage [PAR] While the Sputnik launch was a single event, it marked the start of the space age 
... of Scientific Unions decided to establish July 1, 1957, to December 31, 1958, ... 
the White House announced plans to launch an Earth-orbiting satellite for the IGY 
... U.S. Then the Soviets struck again; on November 3, Sputnik II was launched,... [DOC] [TLE] The Early Satellites | NASA [PAR] Apr 2, 2004 ... That metal ball was Sputnik 1, and its launch marked the beginning of the age of 
space exploration. ... America's space program was originally run by the military, 
with the Army, Navy and Air ... 31, 1958, the U.S. Army Ballistic Missile Agency 
successfully launched the first American satellite, Explorer 1. [DOC] [TLE] Explorer 1: The First U.S. Satellite - Space.com [PAR] Sep 28, 2012 ... Explorer 1 launched successfully into space in 1958, bringing the United States 
into the Space Race. ... The satellite marked a moment when the United States 
got its ... the V-2 missile program that sent bombs to England during World War II. 
... The Soviet Union rocketed Sputnik into space on Oct. 4, 1957. [DOC] [TLE] Sputnik: The Satellite That Inspired Generations - Miles Ahead [PAR] Russian rocket development programs after that time focused largely on missiles, 
not ... could reach orbital velocities (around 8000 meters per second) (Harford). ... 
On October 4, 1957, this first satellite was successfully launched in the USSR. .... 
off on January 31, 1958 when the United States put their first satellite into orbit. [DOC] [TLE] History of Sputnik. Explorer. Vanguard. 1957. 1958. First space ... [PAR] Explorer. Vanguard. 1957. 1958. First space launch. Artificial satellite. ... 345  
comparative sizes of first Soviet and American space launchers ... Leading Soviet 
specialists and their vast design bureaus, research institutions, and ... When the 
Atlas program was restarted as the MX-1593 in January 1951, it called for 
delivery... [DOC] [TLE] Sputnik launched - Oct 04, 1957 - HISTORY.com [PAR] The Soviet Union inaugurates the Space Age with its launch of Sputnik, the 
world's first ... The first U.S. satellite, Explorer, was launched on January 31, 1958
. ... another ideological victory when they launched a dog into orbit aboard 
Sputnik 2. The Soviet space program went on to achieve a series of other space 
firsts in... [DOC] [TLE] Spacecrafts launched in 1958 [PAR] Explorer I, first U.S. Earth satellite, launched by a modified ABMA-JPL Jupiter-C, 
with .... It failed to orbit when the fourth stage of the rocket failed to ignite; 
impacted after 823 seconds

Question: The U.S. launched its first satellite in 1958, while the second in this Soviet program was orbiting
Answer: Sputnik