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NASA's orbiting Kepler telescope has discovered its first planet in the habitable zone of another star. By "habitable," astronomers mean that a planet could harbor temperatures conducive to liquid water--and maybe life. [More]

Bill Borucki is the principal investigator for NASA's planet-finding Kepler spacecraft. At a recent meeting of the American Astronomical Society, Borucki explained how long it will be before Kepler can tell us whether habitable, Earth-like planets are common or rare: [More]