= Exoplanet habitability
{wiki}
<Exoplanet habitability> asks whether a world's physical conditions could support life, commonly using sustained liquid <water> as an operational target. This requires more information than <mass>, <radius> or orbital distance alone. <Atmospheric escape>, the volatile inventory, the <greenhouse effect> and heat transport can make bodies receiving similar stellar power very different.
A <circumstellar habitable zone> is a useful model-dependent filter for possible surface liquid <water>. Calculations must specify atmospheric composition and climate assumptions; incident stellar power alone is not a detection of an ocean.<Habitable Zones Around Main-Sequence Stars: New Estimates by Ravi Kumar Kopparapu and others>[Abstract: one-dimensional radiative-convective models, water-loss/maximum-greenhouse limits, and omitted cloud effects]{ref} An <exoplanet biosignature> asks a separate observational question about evidence for biology, and must be interpreted in this planetary context.
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