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  1. Sputnik 1 - Wikipedia

  2. Sputnik and The Dawn of the Space Age - NASA

  3. Sputnik | Satellites, History, & Facts | Britannica

  4. Sputnik launched | October 4, 1957 | HISTORY

  5. Sputnik and the Origins of the Space Age - NASA

  6. NASA | History - Sputnik

  7. Sputnik and the Space Age | National Air and Space Museum

  8. ESA - Sputnik – 60 years of the space age - European Space …

  9. Sputnik and the Origins of the Space Age - history2.nasa.gov

  10. 65 Years Ago: Sputnik Ushers in the Space Age - NASA