The planet, dubbed GJ 667Cc, orbits a red dwarf star 22 light-years from Earth, in the constellation Scorpio. A binary pair of orange dwarf stars are part of the same system. (Related: "'Tatooine' Planet With Two Suns Could Host Habitable Moon?") The new planet has a mass 4.5 times that of Earth and orbits its host star every 28 days. The red dwarf is relatively dim, so the planet receives slightly less light from its star than Earth does from the sun. But most of the star's light is infrared, so the planet should absorb more of its incoming energy...