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sputnik was the frist artifiacl satellites in space
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it caried a dog in to space named laika
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frist us satellite
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explorer 2 is launched but fails to reach orbit
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it functions for 3 years
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is launched 70,700 miles in to the air
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frist man made thing to orbit the sun
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orbits the earth 3 times
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mariner flies past venus
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