sputnik 1 mission - EAS
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Sputnik 1 – Wikipedia
Sputnik 1! 7 Fun Facts About Humanity's First Satellite | Space
Sputnik (@SputnikInt) / Twitter
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Sputnik 1 - Wikipedia
The History of Satellites - Sputnik I - ThoughtCo
Sputnik 3 - Wikipedia
The Space Race: Timeline, Cold War & Facts - HISTORY
Article expired - The Japan Times
Tianwen-1 - Wikipedia