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

It covers nearly three-quarters of our planet but the ocean floor is less mapped than the moon, an astonishing fact driving a ...

The latest analysis of data from the Galileo probe reveals surprising clues about Callisto, one of Jupiter's moons. These ...

A huge haul of 128 newfound satellites might be a hint of past collisions in the planet’s orbit, or something else.

Europa is the sixth largest satellite in our Solar System and the smallest of Jupiter’s four Galilean moons. Discovered by ...

Tense, public squabbles between SpaceX CEO Elon Musk and NASA have stirred the space industry, but behind the scenes, space ...

Europa, one of Jupiter’s intriguing moons, is hiding an ocean beneath its icy shell — an ocean that might harbor alien life.

Io’s long-debated magma ocean may not exist. Juno spacecraft data reveals that tidal forces deform the moon differently than ...