Diones are a group of celestial bodies known as moons, specifically referring to one of the moons of the planet Saturn. Dione is the fourth-largest moon of Saturn and is composed mainly of water ice and rock. It has a surface marked by bright, icy regions and darker, heavily cratered areas, indicating a complex geological history. Dione orbits Saturn at a distance of about 1,123 kilometers and has a diameter of approximately 1,123 kilometers. It is part of a family of moons that includes other notable satellites like Titan and Rhea. Dione's surface features suggest that it may have experienced tectonic activity in the past.