Surface features of Uranus' icy moon Miranda point to the existence of a once deep ocean, one that still may exist today.

Learn how ice crystallizes on the surface of Europa, a moon of Jupiter, may hold promise for signs of extraterrestrial life within its subsurface ocean.

"Thanks to a gravitational quirk, the outer solar system can be quite balmy." Switching Teams The evidence that Mimas, Saturn's "Death Star" moon, may be home to a giant underground ocean is growing.