October 4, 1957
Sputnik 1 launched by U.S.S.R.
On this day in 1957 the Soviet Union launched Sputnik 1, the first artificial satellite, which orbited Earth until 1958, inaugurated the space age, and heightened Cold War competition between the U.S.S.R. and the U.S.
Taken from: https://www.britannica.com/on-this-day/October-4
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