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was the first artificial Earth satellite
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Breaks earths atmosphere
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series probes were developed by the Soviet Union between 1961 and 1984 to gather data from Venus
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first human spaceflight program of the United States
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It carried a complement of experiments to probe Venus' atmosphere with radio waves
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was a space station launched and operated by NASA (the space agency of the United States) and was the U.S.'s first space station
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was the first of two spacecraft (along with Viking 2) sent to Mars as part of NASA's Viking program
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was the first spaceworthy Space Shuttle in NASA's orbital fleet
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was an unmanned NASA spacecraft which studied the planet Jupiter and its moons
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is a space telescope that was carried into orbit by a Space Shuttle in 1990 and remains in operation.
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