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Sputnik 1 - Wikipedia
Sputnik 1 - NASA
Sputnik | Satellites, History, & Facts | Britannica
Sputnik and The Dawn of the Space Age - NASA
Sputnik launched | October 4, 1957 - HISTORY
65 Years Ago: Sputnik Ushers in the Space Age - NASA
NASA | History - Sputnik
Sputnik at 60: Read Original 1957 Coverage of Launch - TIME
Sputnik: The Space Race's Opening Shot
ESA - Sputnik – 60 years of the space age - European Space …