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was a satilite that studied jupiter and 61 of its moon
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it was the first artificial satilite in space
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Alan Shepard was the first U.S. citizen in space
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Yuri A. gagurin was the frst human in space
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was the 1st spacecraft that landed on the moon
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the first sattilite to orbit and take images of the surface of mercury
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a space probe that landed on venu
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