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Earthlike planet found, but extremely hot

Kepler 78b, a planet some 400 light-years away, is like hell on earth. Astronomers described it as the first Earth-size planet that seems to be made of the same mixture of rock and iron as Earth, and that orbits a star similar to our sun. But Kepler 78b would not be a pleasant place to visit. It whirls around its parent star, Kepler 78, at a distance of less than a million miles, and its year — the time it takes to complete one orbit — is just eight and a half hours. At that close proximity, the surface of Kepler 78b is…