Uranus’ Moons Ariel and Miranda may have oceans beneath their icy surfaces: NASA study

One or two of Uranus' 27 moons -- Ariel and/or Miranda -- likely have oceans beneath their icy surfaces and are actively spewing material into the space environment, according to a study by NASA. Previously, Jupiter, Saturn and Neptune were found as hosts to at least one icy moon that's pumping particles into its planetary system.