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Loading contentThe one requirement every known form of life shares — a liquid solvent for its chemistry. The habitable zone is defined by where a planet could hold liquid water on its surface, but subsurface oceans extend the possibilities far beyond it.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.