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Loading contentA world with a large body of liquid water — most securely the global oceans hidden beneath the ice of moons like Europa and Enceladus, and possibly some water-rich exoplanets. Ocean worlds are among the most promising places to search for life beyond Earth.
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.