Callisto, Jupiter's second-largest moon, may have a rocky surface with an ocean beneath the surface. Corey J. Cochrane, NASA/JPL-Caltech If there was a contest for the most interesting moon in our ...

Callisto, Jupiter's moon, is likely an ocean world, with evidence suggesting a subsurface ocean beneath its ice shell. Reanalysis of Galileo spacecraft data, ...

A moon of Jupiter about the size of Mercury likely has a several-miles-deep ocean under its icy shell, according to a new study.. This Jovian moon, Callisto, is the outermost of 95 circling the ...

The geologically dead Callisto. Jupiter's second-largest moon Callisto, which is almost as big as Mercury and has 142 known craters marking its surface, is among the most battered moons in the ...

A subsurface sea on Saturn’s moon Enceladus spews plumes of water vapor into space. And there are tantalizing hints that oceans could exist on Ganymede, Callisto, Titan, and other distant moons ...

Io is dotted with active volcanoes, and Europa hides a subsurface ocean many want to check for alien life. Ganymede is the largest moon in the solar system, and Callisto is the system's most ...

A subsurface sea on Saturn’s moon Enceladus spews plumes of water vapor into space. And there are tantalizing hints that oceans could exist on Ganymede, Callisto, Titan and other distant moons, too.

For decades. researchers have theorized that resting beneath Callisto's pockmarked surface is a liquid saltwater ocean that spans the entire moon. After taking a closer look at data from 30 years ...