Diameter: Approximately 5,268 kilometers (3,273 miles) Ganymede is the largest moon in the Solar System, even larger than the planet Mercury. It has a subsurface ocean that may contain more water ...

A subsurface sea on Saturn’s moon Enceladus ... Pluto’s moon Charon might have lost an ocean. And Europa’s and Ganymede’s oceans are pretty old. That a moon could form a new ocean well ...

The measured heights of the tidal peaks in the ice crust, which occur periodically during Ganymede's orbit around Jupiter, will provide clues as to whether there is a liquid ocean beneath the outer ...

At Callisto, during 21 flybys JUICE will study its cratered surface, look for evidence of a subsurface ocean and change the angle of its orbit around Jupiter to help it get into orbit of Ganymede.

and Ganymede. Mimas, a moon of Saturn, and Ceres, the largest asteroid in the solar system, might also have subsurface oceans — but scientists aren't yet sure how big each one might be ...