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Sputnik 1 - Wikipedia
Sputnik and The Dawn of the Space Age - NASA
Sputnik | Satellites, History, & Facts | Britannica
Sputnik launched | October 4, 1957 | HISTORY
Sputnik and the Origins of the Space Age - NASA
NASA | History - Sputnik
Sputnik and the Space Age | National Air and Space Museum
ESA - Sputnik – 60 years of the space age - European Space …
Sputnik and the Origins of the Space Age - history2.nasa.gov
65 Years Ago: Sputnik Ushers in the Space Age - NASA