This ultraviolet image comes courtesy of the Hubble Space Telescope. Taken on Nov. 26, 1998, it shows an electric-blue aurora on the giant gas planet. These auroras are unlike anything we would see here on Earth. These auroras show magnetic "footprints" of three of Jupiter's largest moons, according to NASA. They are the "image from Io (along the left hand limb), Ganymede (near the center), and Europa (just below and to the right of Ganymede's auroral footprint)."