NASA’s Kepler mission discovers Earth’s older, bigger cousin.
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NASA’s Kepler mission has discovered Kepler-452b, the first near-Earth-size planet in the “habitable zone” around a sun-like star, the agency announced Thursday.

Kepler-452b is the smallest planet discovered orbiting in the habitable zone, according to NASA. The habitable zone refers to the area around a star where liquid water could pool on the surface of an orbiting planet.