So far, geysers have not been discovered on other planets, however, geyser-like activity has been documented on some of the moons in our solar system. Jupiter's moon, Io, has eruptions of frozen water particles and other gases through vents in its surface. Triton, a moon of Neptune, and Enceladus, a moon of Saturn, also have these cold geysers sometimes called "cryovolcanoes". They are thought to erupt from pools of liquid water located a short distance below the the surface of these moons. On the surface the eruptions are like a "volcanic snow