sputnik 1 - SERP Analysis

https://en.wikipedia.org/wiki/Sputnik_1

https://www.nasa.gov/history/sputnik/index.html

https://www.newscientist.com/definition/sputnik-1/

https://www.museumofflight.org/exhibits-and-events/spacecraft/sputnik

https://www.history.com/this-day-in-history/october-4/sputnik-launched

https://www.ebsco.com/research-starters/engineering/sputnik-space-program

https://www.britannica.com/technology/Sputnik

https://2001-2009.state.gov/r/pa/ho/time/lw/103729.htm

https://guides.loc.gov/sputnik-and-the-space-race

https://www.space.com/17563-sputnik.html