Possible subsurface oceans on Uranus' moons, suggests NASA
Two of Uranus' moons, Ariel and Miranda, may have active subsurface oceans that are blasting plumes of material into space, according to a new study that examined radiation and magnetic data collected by NASA's Voyager 2 spacecraft in 1986. The study team found that one or two of the ice giant's 27 known moons are adding plasma particles into the Uranus system, indicating the presence of subsurface oceans. The mechanism by which the moons are doing this is currently unknown, but it is similar to particle-releasing moons around other ice giants and gas giants.