The icy dwarf planets Eris and Makemake have surfaces bearing methane ice of unknown origin. The two planets may have warm oceans.
Saturn's small, crater-covered moon Mimas may have a vast ocean under its thick icy surface, according to a new paper.
Scientists now believe Miranda and Ariel, the smallest and second-smallest of Uranus’s five major moons, could be expelling vapour plumes - which on other moons in the solar system are thought to come from subsurface oceans.
