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Scientists Spot A Planet That Looks Like 'Earth's Cousin'

An artist's rendering of Kepler-186f, the first validated Earth-size planet to orbit in the habitable zone of a distant star. (NASA/SETI Institute/JPL-Caltech)
An artist's rendering of Kepler-186f, the first validated Earth-size planet to orbit in the habitable zone of a distant star. (NASA/SETI Institute/JPL-Caltech)

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