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Sputnik 1 is the first object sent into space
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This is the first american satellite to orbit the earth
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NASA is formed
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First human in space
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First American citizen to go into space
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John Glenn is the first United States citizen to orbit the earth
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Neil Armstrong and Buzz first walk on the moon
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The first american space shuttle is launched
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The space shuttle explodes shortly after take off
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Human habitation in the international space station
