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.

Towards the end of the mission, the JUICE probe dedicates its experiments in detail to the largest moon in our Solar System, Ganymede. The focus is on a suspected ocean under a kilometre-thick ice ...

Now another moon appears to be secretly flooded. Saturn’s moon Mimas, known for its uncanny resemblance to the Star Wars Death Star, might harbor liquid water beneath its icy shell. If true ...

A Chinese study found that the Moon was wholly covered by a molten “magma ocean” in the early phases of its formation. A study by the China National Space Administration, published in the ...

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 of the gas giant: they are the Galilean moons, four of the 95 natural ...