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Kepler-186f: The First Earth-size Habitable Zone Planet of Another Star

The diagram compares the planets of our inner solar system to Kepler-186, a five-planet star system about 500 light-years from Earth in the constellation Cygnus. The five planets of Kepler-186 orbit an M dwarf, a star that is is half the size and mass of the sun.  Image Credit: NASA Ames/SETI Institute/JPL-Caltech Kepler-186 and the…

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