Astronomers have discovered the most hospitable exoplanet yet found orbiting the star Gliese 581, about 20 light years from Earth. The new planet has been named Gliese 581g, one of two additional planets discovered orbiting Gliese 581, brings that star’s system to six planets. Gliese 581g has a mass between 3 and 4 times that of Earth and orbits in the middle of the star’s habitable zone. The planet is believed to be tidally locked to its primary.
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