The Moons of Jupiter and Saturn Have an Ocean

Jupiter has an ocean. It's actually considered to be the largest ocean in the solar system, but it's a hydrogen ocean. Ganymede harbors and underground ocean containing more water than all the oceans on Earth. Does Saturn have an ocean? Well, it's the same like Jupiter. And if that wasn't enough for you, there is great news: Two of Uranus' moons may support active oceans.