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 ...

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.

An ancient impact Ganymede has long intrigued Hirata, who said he believes uncovering its evolution is “meaningful.” The moon’s surface is a study in contrasts, with bright regions of ridges ...

Ganymede is a tidally locked moon, which means it always shows the same face to Jupiter—and, as a result of the impact, the crater is permanently shielded from Jupiter’s view.

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, hot electrified gas ...

Diagram of the ancient Ganymede impact sending the moon tilting. Kobe University. 3 / 4. Image showing the fractures caused by the impact and the impact site (red cross) Kobe University. 4 / 4.

At nearly 3,300 miles in diameter, Ganymede is also the solar system’s largest moon—bigger even than the 3,030-mile wide planet Mercury. But that doesn’t mean it’s impervious to a pounding.

An asteroid 20 times larger than the one that may have wiped out the dinosaurs struck Jupiter's moon Ganymede some 4 billion years ago, dramatically shifting the possibly life-hosting satellite's ...

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. CNN values your feedback 1.

By Ashley Strickland, CNN (CNN) — Jupiter’s moon Ganymede may have shifted on its axis when a massive asteroid smashed into it about 4 billion years ago, according to a new study. Ganymede ...