Tethys 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. Tethys has a diameter of about 1,062 kilometers and orbits Saturn at a distance of about 295,000 kilometers. Its surface is heavily cratered, and it has a large, prominent impact crater called Odysseus, which is about 400 kilometers wide and covers almost three-quarters of the moon's diameter. Tethys is composed mainly of water ice, with small amounts of rock and other materials. Its surface is also marked by a series of long, steep cliffs called scarps, which are up to several kilometers high and extend for hundreds of kilometers across the moon's surface. One of the most interesting features of Tethys is a large canyon called Ithaca Chasma, which runs for more than 2,000 kilometers along the moon's surface. The canyon is up to 100 kilometers wide and several kilometers deep, and its origin is still the subject of scientific investigation. Tethys also has a very low density, indicating that it is probably not composed entirely of solid material. This has led scientists to speculate that the moon may have a partially liquid interior, with an ocean of liquid water sandwiched between layers of ice. Tethys 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 Tethys and have helped to deepen our understanding of the Saturnian system.
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