If there was a contest for the most interesting moon in our solar system, Callisto would be a contender. Jupiter's second-largest moon has more impact craters on its surface than any other planetary ...

Callisto is also thought to have liquid water, too. The small, rocky body is constantly being stretched and compressed by Jupiter’s huge gravitational force, keeping the moon ‘malleable ...

Experts analyzed satellite imagery of planetary surface cracks and compared them with Earth's geologic features, searching ...

The ringed gas giant Saturn has officially replaced Jupiter as the planet in our solar system with the most moons. The ...

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

For centuries, Jupiter reigned as king of the moons. Initially, the Big Four, discovered by Galileo, and then as optics and astronomy advanced, more and more, smaller and smaller bodies, until Big J ...

Using data collected by NASA's Juno spacecraft as it flew past Jupiter's highly volcanic moon Io in late 2023 and again in ...

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

“These moons are a few kilometers in size and are likely all fragments of a smaller number of originally captured moons that ...

Canadian and other researchers have confirmed Saturn as the solar system’s undisputed “moon king," after discovering 128 more moons c.