Habitable zone

The habitable zone is the range where complex, multicellular life can naturally evolve as a result of a liquid solvent existing in all three phases. Life can arise almost anywhere in the universe, but within the habitable zone, the probability of the formation of advanced civilizations is most likely.

Main sequence

 * Class M -
 * Class K -
 * Class G - 0.82 AU to 1.2 AU
 * Class F -