October 4, 1957: Sputnik... www.theatlantic.com

Remembering the Sputnik 1... www.arrl.org

Sputnik (2020) - IMDb www.imdb.com

Sputnik-2 www.russianspaceweb.com

What Did The Sputnik... www.afrikaiswoke.com

Sputnik and American... slate.com

Sputnik 1 and the Space Age... astrobiology.nz

4 October 1957 – Sputnik 1... explainingscience.org

Sputnik 3 - Wikipedia en.wikipedia.org

Russians launch Sputnik... www.razorrobotics.com

Sputnik | Satellites,... www.britannica.com

10 Facts About Sputnik -... www.havefunwithhistory.com

Sputnik 3 - The First... www.youtube.com

The Sputnik Shock - The... www.theglobalist.com

October 4, 1957: The Launch... aerospacelectures.com

Amazon.com: Sputnik:... www.amazon.com

Sputnik Launch Ignites the... mediarichlearning.com

The First Real Sputnik |... hackaday.com

Sputnik 3 In Orbit #2 by... sciencephotogallery.com

Sputnik 1, Earth's First... www.space.com