NASA announced that it has evidence that Jupiter’s moon Ganymede, the largest moon in our solar system, has a vast ocean lurking underneath its icy crust. WSJ's Monika Auger reports. Photo ...

A colossal asteroid, estimated to be 20 times larger than the one that led to the extinction of the dinosaurs on Earth, has left a permanent mark on Jupiter’s largest moon, Ganymede. This ...

A colossal asteroid slammed into Jupiter's largest moon Ganymede with so much power it dramatically and permanently ...

Jupiter's largest moon Ganymede is generating "killer" waves of electrons that astronomers say could damage spacecraft going on future missions. These electromagnetic waves can be found all around ...