Volcano on dwarf planet erupts ice: NASA
NASA's Dawn mission has discovered a volcano on Ceres, a dwarf planet, that is made of ice instead of lava. Ahuna Mons, the 4000-metre high mountain is a cryovolcano, which ejects extremely salty water that freezes on the surface. Ceres, which orbits the Sun between Mars and Jupiter, has witnessed similar geological activity in the past billion years.