First Artificial Satellites
S.No. Satellite Country Launch Year
1 Sputnik1 U.S.S.R Oct. 4 1957
2 Sputnik2 U.S.S.R Nov. 4 1957
3 Explorer 1 U.S.A Feb. 1 1958
4 Vanguard 1 U.S.A Mar. 17 1958
5 Sputnik 3 U.S.S.R Mar. 26 1958
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