Saturn’s Ocean Moon Was Hiding in Plain Sight
This article was originally published by Knowable Magazine.
The outer solar system is awash with liquid water. A briny ocean is concealed beneath the icy crust of Jupiter’s fourth-largest moon, Europa—with more water than all of Earth’s oceans combined. A subsurface sea on Saturn’s moon Enceladus spews plumes of water vapor into space. And there are tantalizing hints that oceans could exist on Ganymede, Callisto, Titan, and other distant moons, too.