Saturn's Icy Secret: How a Tiny Moon Called Enceladus Became the Solar System's Biggest Surprise
Move over, Pluto — there's another small world in our solar system that's completely rewriting the rulebook. Enceladus, one of Saturn's dozens of moons, is hiding a liquid water ocean beneath its frozen shell, and scientists think it might be one of the best places in the cosmos to look for life. Here's how we found it, and why it matters.