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Loading contentA layer of liquid water beneath an icy shell, kept warm by tidal heating and in contact with a rocky seafloor. Europa and Enceladus have them; they are the leading places to look for life beyond Earth, and the target of the Europa Clipper mission.
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.