This footage from the U.S. Army's "The Big Picture" TV series recounts the tense days leading up to the successful launch of America's first satellite in 1958.

Explorer 1: America's First Satellite

Video and audio podcasts from NASA's Jet Propulsion Laboratory feature the latest news on space and science findings from JPL and NASA. Topics include discoveries made by spacecraft studying planets in our solar system, including Mars, Saturn and our home planet, Earth. Missions also study stars and galaxies in our universe. Other topics cover tips for amateur astronomers and updates from the Mars Rover and Cassini missions.

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Explorer 1: America's First Satellite

Explorer 1: America's First Satellite

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