The discovery has raised a lot of questions. How do you spot moons, and why hadn’t anybody seen these ones already? Doesn’t Jupiter have the most moons? What are they going to call all these ...

To put it into perspective, that’s nearly double all the other planets’ moons. Poor Jupiter, once the reigning moon king, now ...

Ganymede, Jupiter's largest moon and the solar system's largest, is bigger than Mercury and the dwarf planet Pluto, with a diameter of 5,268 kilometers.

Fluorescent caves deep below America show how alien life could exist on one of Jupiter's moons, say scientists. The chemistry in Wind Cave, South Dakota, means that, under an ultraviolet (UV ...

With a whopping total of 274 moons, researchers say Saturn’s tug of war with Jupiter for the title is settled once and for all.