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Sputnik 1


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Sputnik 1
   was   
The First Artificial Satellite
Launched into geocentric orbit by the Soviet Union on 4 October 1957, it was the first of a series of satellites collectively known as the Sputnik program. The unanticipated announcement of Sputnik 1's success precipitated the Sputnik crisis in the United States and ignited the Space Race within the Cold War.






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