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Gliese 581d: A Possibly Habitable Planet around a Red Dwarf Star

Dirk Schulze‐Makuch, E. F. Guinan

Abstract

Gliese 581d is a terrestrial super-earth planet, located on the inside edge of the habitable zone away from its parent star. If Mars would be that size in our Solar System, Mars would likely be a habitable planet in a traditional sense (stability of liquid water on its surface). The same is likely true for Gliese 581d, which makes it a promising candidate of the extrasolar planets detected so far to support life. Planets around red dwarf stars (dM) appear in principle at least as suitable for the development of life as planets around dG stars.

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Key concepts: Circumstellar habitable zone, Astrobiology, Habitability of orange dwarf systems, Planetary habitability, Planet, Physics, Terrestrial planet, Exoplanet