Last time, NASA’s Kepler planet-finding mission found a planet in the right orbital location to support life, but it was the wrong size. This time, Kepler has found two planets of the right size but in the wrong location. The Kepler team reported Dec. 20 that it has located an Earth-like star called Kepler-20 orbited by five planets, including two — Kepler-20E and -20F — that are the closest in size to Earth of any planets yet discovered outside our own Solar System. But they are so ...
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