Kepler-186f
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NASA finds Earth-sized planet that could support life
NASA's Kepler telescope has discovered a veritable bounty of alien planets, but none of them have been quite like Earth -- until now. Today, the agency announced that Kepler-186f is the first confirmed Earth-sized planet in the habitable zone of another star. In other words, it's the right size and distance from its sun to have properties similar to our planet -- namely, a rocky composition and liquid water on its surface.
