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The Earth-like planets

Habitable alien planets similar to Earth may not be that rare in the universe, a new study suggests.


About one in five sunlike stars observed by NASA’s planet-huntingKepler spacecraft has an Earth-size planet in the so-called habitable zone, where liquid water — and, potentially life — could exist, according to the new study. If these results apply elsewhere in the galaxy, the nearest such planet could be just 12 light-years away.

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