NASA
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NASA awards contracts to four private space companies
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Rosetta orbiter science data reveals surprising facts about comet 67P/Churyumov-Gerasimenko
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Asteroid 2014 RC buzzed by Earth dangerously close last weekend: What you should know
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NASA time capsule mission sends your tweets to space
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Up or down? Astronauts ponder critical question during lunar walk
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NASA experiments with 3D-printing technology to create complex rocket parts
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Rosetta's potential landing sites to be revealed, mission gets first results
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Extraordinary satellite photos capture erupting volcano from space
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Rosetta sends back its first scientific data on the comet it's orbiting
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Mars rover Curiosity is 'a poor science return': NASA panel
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Zero-gravity 3D printer heading to ISS
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Newly found asteroid to glide closely past Earth this Sunday
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