Scientists have discovered salt particles ejected from volcanic plumes on Enceladus, one of the moons of Saturn. The particles provide the strongest evidence yet that these plumes are supplied by a liquid ocean beneath the moon’s surface, and could solve one of the most controversial issues in planetary science.
Also, check out this week’s edition of Nature, where Frank Postberg and colleagues analyze the composition of ice particles in Saturn's E ring (the 5th one out from center), and discuss why they think the sodium near Saturn may proove the existence of a liquid ocean. The authors say that the salty minerals they've observed have been washed out of rocks at the bottom of the sea, in a process similar to that which occurs on Earth.
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