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Sputnik 1 - Wikipedia
Sputnik and The Dawn of the Space Age - NASA
Sputnik 1 - NASA
Sputnik | Satellites, History, & Facts | Britannica
Sputnik launched | October 4, 1957 - HISTORY
NASA | History - Sputnik
Sputnik and the Origins of the Space Age - NASA
NASA - NSSDCA - Spacecraft - Details
Sputnik: The Space Race's Opening Shot
Oct 4, 1957 CE: USSR Launches Sputnik - National Geographic …