Europa is not supposed to look the way it does. Jupiter's icy moon is scarred by a chaotic patchwork of fractured terrain, crisscrossed ridges, and disrupted surface regions that suggest something dynamic is happening beneath its frozen shell. Scientists have long suspected that a vast liquid ocean, kept warm by the gravitational kneading of Jupiter's enormous gravity, lies hidden beneath that ice. Now, a new study using the James Webb Space Telescope is adding a crucial piece to the puzzle, and...