Sputnik with its puppy dog passenger( Laika ) was launched in October 1957, and remained in orbit until early 1958, when it reentered EarthÂ’s atmosphere and burned up
Sputnik 1 was in orbit for 3 months, completing 1440 orbits.
Sputnik 2, Laika's flight, was in orbit for 162 days. There were other missions, but these two, especially Sputnik 1, were the ones to capture the world's - especially the US'- attention.
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