Ganymede is the sole acknowledged moon with its own magnetic subject, which will cause auroras akin to those on this planet. The auroras sway when Jupiter’s magnetic area fluctuates, partial proof for a big saltwater ocean. Giant-affect speculation. In Wikipedia. By NASA/JPL-Caltech, Public Domain, Wikipedia Moons variety by way of https://martinhllkj.blog2learn.com/82351049/bestmoons-no-further-a-mystery