NASA’s Kepler planet-finding space telescope has discovered three “super Earths” orbiting in the habitable zone of two distant stars, including the one nearest the Earth in size yet discovered. The planet designated Kepler-62f measures 40% larger than Earth, and is believed to have a rocky composition. It and its larger, habitable-zone companion, Kepler-62e, orbit a star dimmer and older than the Sun called a K2 dwarf that is 1,200 light years from Earth in the constellation Lyra. A ...

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