Tethys is one of the moons of Saturn and was discovered by the Italian astronomer Giovanni Domenico Cassini in 1684. It is the third-largest moon of Saturn and is primarily composed of water ice and rock, making it one of the more geologically interesting bodies in the Saturnian system. Key features of Tethys include: 1. **Size and Composition**: Tethys has a diameter of about 1,062 kilometers (660 miles).
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