New simulations show that Jupiter's massive moon Ganymede was knocked off its axis when it was struck by a roughly 90-mile-wide asteroid around 4 billion years ago. The colossal collision was likely ...

Two icy moons of Jupiter, though neighboring and of similar size, exhibit radically different internal structures. A new study suggests this dichotomy stems from their very formation, ...

While Ganymede hasn’t yet been observed spewing plumes of water vapor like Saturn’s moon Enceladus, Jupiter’s largest moon is most likely hiding an enormous saltwater ocean.

A new study revealed that a massive asteroid may have hit Jupiter’s moon Ganymede about 4 billion years ago, shifting the moon on its axis.

Ganymede is a particularly weird place. Not only is it Jupiter’s most massive satellite, it’s the biggest moon in the whole solar system.

An artist's impression of ESA's Jupiter Icy Moons Explorer -- JUICE - in orbit around giant planet, flying past its largest moons (left to right): Ganymede, volcanic Io, Jupiter (with auroral ...

Ganymede is also the only moon in the Solar System with a magnetic field—a bubble-shaped region of charged particles. Scientists have spotted aurorae—as ribbons of glowing, ...

Ganymede’s asteroid was fully 5% of its diameter. That kind of blow not only left a scar, it also knocked the world cockeyed. According to Naoyuki’s calculations, ...

A new study revealed that a massive asteroid may have hit Jupiter’s moon Ganymede about 4 billion years ago, shifting the moon on its axis.