Ganymede is the only real recognised moon with its possess magnetic field, which leads to auroras akin to those on the planet. The auroras sway when Jupiter’s magnetic field fluctuates, partial proof for a significant saltwater ocean. Ordinarily the phrase moon brings to mind a spherical item, like Earth's Moon. https://moons27148.blogsmine.com/35140831/the-single-best-strategy-to-use-for-moons