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How common are habitable planets?

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November 4, 2013 3:03 PM EST One in every five sunlike stars is orbited by a potentially habitable planet, according to a new analysis of observations by NASA’s Kepler Space Telescope. (Video courtesy of Petigura/UC Berkeley; Howard/UH-Manoa; Marcy/UC Berkeley; Illumina Studios, Emeryville, Calif.)

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