Ganymede is the largest moon in our solar system ... In 2015, Cassini flew through the plumes and found hydrogen, one of the three primary necessities for life. Titan is believed to have a salty ...

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.

"The TIGRE mission contains a drill design, which will reach the subsurface ocean and collect water samples ... including Jupiter's moons, Europa and Ganymede, with both presenting evidence ...

This cutaway image of Pluto shows a section through the area of Sputnik Planitia, with dark blue representing a subsurface ocean and light blue for the frozen crust. Disclaimer: AAAS and EurekAlert!

and Ganymede. Mimas, a moon of Saturn, and Ceres, the largest asteroid in the solar system, might also have subsurface oceans — but scientists aren't yet sure how big each one might be ...