Saturn's snowball moon Enceladus has a neat feature. While not entirely unique among outer solar system moons, Enceladus has the largest and most active cyrovolanic plumes of water ice. They're fed by large subsurface oceans, even holding evidence of deep hydrothermal vents. All this water must go somewhere: Enceladus is constantly replenishing Saturn's wide and diffuse E Ring.

Images: NASA/JPL-Caltech/SSI/CICLOPS/Kevin M. Gill

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