An artist's depiction of the surface of the planet Proxima b as it orbits the red dwarf star Proxima Centauri, the closest star to our solar system. The planet is a bit more massive than Earth, scientists say, and circles its star once every 11 days. ESO/M. Kornmesser/Nature hide caption

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This Planet Just Outside Our Solar System Is 'Potentially Habitable'

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What It's Really Like To 'Walk' In Space

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Lasers and mirrors are used to carefully measure shifts in space-time. To avoid contamination, protective clothing must be worn at all times. LIGO Lab/Caltech/MIT hide caption

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How To Catch The Biggest Wave In The Universe

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Short Answers To Big Questions: The Power Of Earth's Magnetic Field

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The Japanese Subaru Telescope on Mauna Kea in Hawaii has the right attributes for searching for Planet Nine. National Astronomical Observatory of Japan hide caption

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Astronomers Are On A Celestial Treasure Hunt. The Prize? Planet Nine

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Astronomers Predict Incredible Show As Perseid Meteor Shower Peaks

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Short Answers To Big Questions: Exploring Atoms In Space

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An illustration of the company's landing vehicle on the surface of the moon. Moon Express via AP hide caption

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Florida Company Gets One Bureaucratic Step Closer To Landing On The Moon

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The Mystery Of The Fireball That Lit Up The Western Sky

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Though Jupiter's red spot looks small in this photo, it's actually about 10,000 miles wide — bigger than Earth's diameter. Space Telescope Science Institute/NASA hide caption

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How Jupiter's Red Spot Makes Things High Above It Hot, Hot, Hot

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