Callisto would be a contender. Jupiter's second-largest moon has more impact craters on its surface than any other planetary body in the solar system, and it has tons of ice on its surface as well.

increasing the movement of particles and a higher likelihood of interesting things happening under the surface. Callisto, the outermost of Jupiter’s 95 moons, first caught NASA’s attention ...

New evidence from an old NASA mission supports the theory that Jupiter's moon Callisto is in fact an ocean world.

These pinpricks of light are actually Jupiter's four largest moons, now known as the Galilean moons: Io, Europa, Ganymede, and Callisto ... Volcanoes rage on Io's surface, earning it the title ...

Its icy surface has ... Space Agency's Jupiter Icy Moon Explorer (JUICE) — which will also be exploring Europa, in addition to its larger cousins Ganymede and Callisto — performed a daring ...

But it hasn’t always been this way. Jupiter’s four largest moons – Io, Europa, Ganymede and Callisto – were the first ever discovered orbiting another planet. They were spotted by Galileo ...

only two moons are visible flanking the gas giant. Ganymede is far to the west and Callisto lies far to the east. But keep your telescope trained on the space northeast of Jupiter’s disk — Io ...