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 ...

The first time you may have heard the term ‘dwarf planet’ was when Pluto got demoted to one in 2006 (RIP). However, we actually have six in our Solar System. Pluto, Ceres, Makemake, Haumea, and Eris ...

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 ...

Ganymede is the largest of the 100-plus ... is very significant because it means something is heating the moon up enough for ...

It’s possible that the small moon may have once held water, like Europa or Ganymede, as ice was once common in its part of the solar system. However, a combination of radiation from Jupiter and ...