If there was a contest for the most interesting moon in our solar system, Callisto would be a contender. Jupiter's ...

More pocked with craters than any other object in our solar system, Jupiter's outermost and second-biggest Galilean moon, ...

Dust off your old telescope on a clear night and look up. If you find Jupiter, you’ll likely see four small dots to the side ...

Callisto, one of Jupiter’s largest moons, looks like a boring, crater-filled world. It doesn’t seem to have much going on ...

New evidence from an old NASA mission supports the theory that Jupiter's moon Callisto is in fact an ocean ... rocks more than 150 miles beneath the surface. Both are key conditions known for ...

NASA's Europa Clipper is about to use Mars' gravitational pull to slingshot itself towards Jupiter's fourth-largest moon ...

and Callisto. Many of these celestial orbs are as remarkable as Jupiter itself. The largest moon in the solar system, Ganymede is also the only moon known to have its own magnetic field.

Its extreme activity is driven by "tidal flexing" from Jupiter's crushing gravity ... that a large dark patch has emerged on the moon's surface. This area is likely covered in solidified ...

A NASA spacecraft has set sail for Jupiter and its moon ... surface. Discovered by Galileo in 1610, Europa is one of the four so-called Galilean moons of Jupiter, along with Ganymede, Io and Callisto.

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