True color image of Saturn's largest moon, Titan, passing in front of the ringed planet taken by NASA's Cassini spacecraft. (Credit: NASA/JPL-Caltech/Space Science Institute) Image of Ganymede, ...

Ganymede is about 4.5 billion years old, ... and 60 percent is lighter in color with grooves that form intricate patterns to give the satellite its distinctive appearance.

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.

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.