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USSR launches Sputnik 1
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Period: to
Timespan
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Period: to
timespan
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USSR launches sputnik 2 with dog named laika
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Explorer 2 is launched but fails to reach orbit
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Sputnik 3 is launced
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Luna is launched by the USSR, man made object
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U.S launches discoverer XIV,And spy technology
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Soviet Union Launches Vanera to Venus
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John G, fisrt man flight
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idea of lunar orbit
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man steps on moon