A lot of oceans in the solar system are much, much bigger than Earth's

In order of how much water each world has, from the least to the most, the wettest are: Enceladus, Dione, Earth, Europa, Pluto, Triton, Callisto, Titan, 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, if they exist at all.

(Chart too small? See the larger version of this graphic here.)