Wednesday, February 22nd, 2017 12:26pm MDT
Three of them may be habitable NASA/JPL-Caltech Seven Earth-size exoplanets orbit the star TRAPPIST-1. Three orbit very close to the star and may be too hot to sustain liquid water on the surface; one may be too cold. But the three planets in the middle may be juuuust right. Planet-hunters are always on the lookout for…
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Tags: Earth, nasa, solar system
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