The Mysterious Inner Workings of Io, Jupiter’s Volcanic Moon

Scientists thought they had Io, Jupiter's hyperactive volcanic moon, pretty much figured out—until new data from recent flybys turned that idea upside down. Turns out, the leading theory about what’s happening beneath its fiery surface might be wrong, leaving researchers scratching their heads. It’s a humbling reminder that even in our own cosmic backyard, some of the most dramatic worlds are still full of surprises.