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first united states satellite to orbit the earth
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first american space shuttle launched
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nasa is fromed
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firtst human in space yuri gagarin
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alan shepard first united states citizen to go in space
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soviete sputnick first sent to space successfully orbit the earth
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neil armstrong first person on the moon
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challenger exploded shortly after takeoff
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human habitation in international space station begins
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john glenn first us citizen to orbit the earth