Explorer 1 Becomes First U.S. Satellite in Orbit
The Soviet Union's launch of Sputnik 1 in October 1957 had ignited the Space Race and raised concerns in the United States about technological leadership. American scientists at the Jet Propulsion Laboratory and Army Ballistic Missile Agency worked rapidly to develop a response. On January 31, 1958, a Jupiter-C rocket carried Explorer 1 into orbit from Cape Canaveral, Florida. The satellite, designed by Wernher von Braun's team, carried a cosmic ray detector and confirmed the existence of the Van Allen radiation belts. Its successful launch restored American prestige in space exploration. Explorer 1 remained in orbit until 1970.
