The observation that water plumes erupt from cracks on Saturn's moon Enceladus has fired speculation about a possible subsurface ocean. The latest searches for sodium salts point to the existence of such an ocean.
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Spencer, J. Enceladus with a grain of salt. Nature 459, 1067–1068 (2009). https://doi.org/10.1038/4591067a
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DOI: https://doi.org/10.1038/4591067a
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