Juno spots missing auroral footprint from Jupiter’s moon Callisto
NASA's Juno spacecraft has found final missing auroral footprint from Jupiter's moons. Jupiter's four largest moons produce unique signatures called satellite footprints; Io, Europa and Ganymede had already shown their footprints, while Callisto, the planet's farthest moon, had remained a mystery. As per Juno's findings, Callisto's faint footprint is sustained much like those of its siblings.