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Explorer 1

Explorer 1
Take a step back in time and follow the historic story of how the United States responded to Sputnik, the world's first Earth-orbiting satellite launched by the Soviets in 1957. JPL designed and built -- and, in cooperation with the Army, launched -- Explorer 1,  the first U.S. satellite and the first spacecraft ever to return scientific data from space.
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Explorer 1

  Explorer 1 Spacecraft
Fifty years ago, on Jan. 31, 1958, the JPL-designed and -build Explorer 1 soared into space, becoming the first Earth-orbiting U.S. satellite. Take a look inside the spacecraft and learn how it worked.
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