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 ...

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

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 ...

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 findings from NASA's Juno probe provide a fuller picture of how widespread the lava lakes are on Jupiter's moon ... eruptions across the surface of the moon, little supporting data exists.

The probe didn't reach its destination, Jupiter ... time's larger than Earth's moon. A bit less than half of its water-ice crusted surface is dark and pitted by impact craters, NASA says.