NASA’s Kepler observatory has located the most Earth-like planet yet discovered beyond the Solar System, but it is so hot that it streams material into space like a comet’s tail. Called Kepler-10b, the planet is 1.4 times the size of Earth but orbits its star, called Kepler-10, 20 times closer than Mercury is to our Sun. Radiation from its star prevents Kepler-10B from having an atmosphere. Kepler-10b is the smallest exoplanet yet discovered. The planet’s surface presents the same ...

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