Dione is a moon of Saturn and is one of the larger moons in the Saturnian system. It was discovered by the Italian astronomer Giovanni Domenico Cassini in 1684. Dione has a diameter of about 1,123 kilometers and orbits Saturn at a distance of about 377,400 kilometers. Its surface is heavily cratered, with some areas covered in bright, icy material and other areas marked by long, linear features called "wispy terrain". Dione is composed mainly of water ice, with small amounts of rock and other materials. It has a relatively low density, suggesting that it may have a partially liquid interior, with an ocean of liquid water sandwiched between layers of ice. One of the most interesting features of Dione is a large, prominent crater called Evander, which is about 110 kilometers wide and has a central peak that rises about 2.5 kilometers above the crater floor. Dione also has a system of fractures called "lineae" that extend across its surface and are thought to be related to tectonic activity. Dione has been visited by several spacecraft, including the Voyager 1 and 2 spacecraft and the Cassini spacecraft, which made numerous flybys of the moon during its mission. These missions have provided valuable insights into the geology and composition of Dione and have helped to deepen our understanding of the Saturnian system.
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