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Sputnik and The Dawn of the Space Age - NASA
Sputnik 1 - Wikipedia
スプートニク - Wikipedia
スプートニク (通信社) - Wikipedia
Sputnik | Satellites, History, & Facts | Britannica
スプートニク計画 - Wikipedia
Sputnik (news agency) - Wikipedia
Sputnik and the Origins of the Space Age - NASA
65 Years Ago: Sputnik Ushers in the Space Age - NASA
NASA | History - Sputnik