HOUSTON — Kepler-186f, a recent discovery from NASA’s five-year-old Kepler mission, a rocky world 500 light years away, is the first validated, Earth-sized planet detected within the habitable zone of a star beyond the Solar System, an international team of astronomers announced April 17. The find, calculated at 1.1 Earth radii in size, is the outermost of five planets orbiting the dwarf star Kepler-186. Kepler-186f appears to be orbiting at the very edge of the habitable zone of ...


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