Do the spectacular plumes of water vapour and ice particles seen on Saturn's icy moon Enceladus come from liquid water just below its frigid surface? That is the fascinating question addressed by Postberg et al.' (page 1098 of this issue) using data from the Saturn-orbiting Cassini spacecraft, and by Schneider et al.2 (page 1102) using ground-based telescopes. Despite their very different techniques, the two teams use the same key element, sodium, in their search for Enceladan water.
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