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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.

Range of liquid waterEdit

Main sequenceEdit

  • Class M - 0.02 AU to 0.28 AU
    • M8 - 0.02 to 0.03 (tidal locking, major tidal heating)
    • M7 - 0.03 to 0.05 (tidal locking, major tidal heating)
    • M6 - 0.05 to 0.09 (tidal locking)
    • M5 - 0.08 to 0.11 (tidal locking)
    • M4 - 0.09 to 0.14 (tidal locking)
    • M3 - 0.11 to 0.18
    • M2 - 0.14 to 0.21
    • M1 - 0.17 to 0.24
    • M0 - 0.20 to 0.28
  • Class K - 0.22 AU to 0.77 AU
    • K9 - 0.22 to 0.32
    • K8 - 0.25 to 0.36
    • K7 - 0.27 to 0.40
    • K6 - 0.30 to 0.45
    • K5 - 0.33 to 0.48
    • K4 - 0.35 to 0.51
    • K3 - 0.38 to 0.56
    • K2 - 0.45 to 0.66
    • K1 - 0.49 to 0.72
    • K0 - 0.53 to 0.77
  • Class G - 0.55 AU to 1.35 AU
    • G9 - 0.55 to 0.80
    • G8 - 0.61 to 0.90
    • G7 - 0.64 to 0.94
    • G6 - 0.68 to 1.01
    • G5 - 0.72 to 1.06
    • G4 - 0.76 to 1.11
    • G3 - 0.79 to 1.15
    • G2 - 0.82 to 1.20
    • G1 - 0.87 to 1.27
    • G0 - 0.92 to 1.35
  • Class F - 0.98 AU to 3.06 AU
    • F9 - 0.98 to 1.42
    • F8 - 1.02 to 1.50
    • F7 - 1.12 to 1.64
    • F6 - 1.19 to 1.75
    • F5 - 1.30 to 1.90 (lifetime possibly too short)
    • F4 - 1.38 to 2.03 (lifetime too short)
    • F3 - 1.56 to 2.29 (lifetime too short)
    • F2 - 1.75 to 2.59 (lifetime too short)
    • F1 - 1.93 to 2.86 (lifetime too short)
    • F0 - 2.09 to 3.06 (lifetime too short)

Range of liquid hydrocarbonEdit

Range of liquid ammoniaEdit

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