has discovered an Earth-like planet 40 light years away that could be a promising candidate to host human life.The , called Gliese 12 b, is slightly smaller than our planet and has an estimated surface temperature of 107 degrees Fahrenheit - assuming it doesn't have an atmosphere.Gliese 12 b sits just inward of the habitable zone - the distance from a star at which liquid water could exist on orbiting planets' surfaces.
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