Kepler is the first NASA mission able to discover planets the size of Earth—and smaller—that are orbiting other stars. Kepler has discovered 11 solar systems and 26 planets, ranging from the size of Earth to larger than Jupiter. By searching for planets that lie within a star's habitable zone—in which a planet could maintain liquid water—the mission may locate terrestrial planets capable of supporting life.
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NASA: The Kepler Mission
NASA Exoplanet Archive