Astronomers find ‘comet’s tail’ trailing Neptune-sized exoplanet Los Angeles Times They call it “the Behemoth.” Astronomers using NASA’s Hubble Space Telescope have discovered that a red dwarf star is boiling off the atmosphere of a Neptune-sized exoplanet, causing it to form an enormous cloud that surrounds and trails the planet like a … Scientists Spot Distant Alien Planet With a Comet-Like TailNBCNews.com
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