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It's possible that not a single known object meets the current criteria, one researcher says.
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Saturn teams up with two bright stars to form a celestial triangle this week.
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NASA’s eight new astronaut candidates share how they reacted to being selected.
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The Lone Signal project wants to send your notes out into the universe.
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Artists can submit visions of future interstellar travel to the FarMaker Interstellar Speed Sketch 2013 contest.
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The four-year-old infrared space observatory turned off for good.
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