Dark material coating Jupiter's moon Europa likely sea salt from subsurface oceans discolored by radiation exposure http://www.nasa.gov/press-release/nasa-research-reveals-europas-mystery-dark-material-could-be-sea-salt …
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Dark material coating Jupiter's moon Europa likely sea salt from subsurface oceans discolored by radiation exposure http://www.nasa.gov/press-release/nasa-research-reveals-europas-mystery-dark-material-could-be-sea-salt …