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The first atomic explosion happened in the U.S.A down in New Mexico, 120 miles south of Santa Fe.
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This when the A-bomb was born and used.
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The Soviets successfully tested their first nuclear weapon at Semipalatinsk.
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Sputnik was the first ever satellite in space sent by the soviets
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Laika was the first animals ever to go into space
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He was the first man ever into space and to orbit the earth
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He was the first american ever to into space and was only 3 weeks after Yuri Gagarin
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