Re: Cores spinning
My recollection is that Io has no magnetic field, while Europa and Callisto have induced magnetic fields, presumably from salt-water oceans. Only Ganymede has an intrinsic magnetic field.
Space/Science » in reply to Cores spinning
My recollection is that Io has no magnetic field, while Europa and Callisto have induced magnetic fields, presumably from salt-water oceans. Only Ganymede has an intrinsic magnetic field.