Enceladus is one of 274 bodies so far discovered in Saturn’s gravitational pull. It measures about 500 kilometers in diameter, making it the planet’s sixth-largest satellite. While this moon does not stand out for its size, it is notable for its cryovolcanoes—geysers at Enceladus’s south pole that spew out water vapor and ice fragments. Plumes of ejected material can extend to nearly 10,000 kilometers in length, which is more than the distance from Mexico to Patagonia, and some of this material rises into space. The outermost of Saturn’s main rings—its E ring—is primarily made up of ice ejected into space by Enceladus.