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Sputnik 1 spurred the U.S to launch it's own satellites.
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The soviet union demonstrates that the soviets have rockets that could send warheads anywhere on earth
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The dog proved that the animals and humans can survive in space.
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Explorer 1 was the first space craft launched by the U.S
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This is important because it was man made object. It also showed that they can build more things to go into space.
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Luna 2 impacts the moon on September 13, becoming the first man-made object to do so.
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John Glenn proved that the nasa and the U.S are making progress and that they will keep andvancing
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L. Gordan Cooper was the last american to fly into space alone
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This event is important because it was the first human to step foot on the moon. This event also shows that we are advancing
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Luna 9 proved that we are making progress and it also proved that the lunar surface could support that weight that it wouldn't sink into the loose layer of dust.