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First Earth-Sized, Rocky Exoplanet Found

  A team of astronomers has found the first Earth-sized planet outside the Solar System that has a rocky composition like that of Earth. This exoplanet, known as Kepler-78b, orbits its star very closely every 8.5 hours, making it much too hot to support life. The results are being published in the journal Nature. This Earth-sized [continue reading]