Hidden oceans on icy moons may be boiling beneath the surface

The outer planets are surrounded by dozens of moons locked in thick shells of ice. Some of these frozen worlds, including Saturn's moon Enceladus, are believed to contain vast oceans of liquid water trapped between their icy crust and rocky interiors. Because liquid water is essential for life as we know it, these moons rank among the most promising places in the solar system to search for extraterrestrial life.

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