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Period: to
Space race
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Space Race
USSR launches Sputnik 1- Oct. 4, 1957 -
Space Race
USSR launches Sputnik 2 which carried a small dog into orbit- Nov. 3, 1957 -
Space Race
Explorer 1, the first American satellite to reach orbit, is launched- Jan. 31, 1958 -
Space Race
Sputnik 3 is launched- May 15, 1958