Tethys (moon)
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Tethys, or Saturn III, is the fifth-largest moon of Saturn, measuring about 1,060 km (660 mi) across. It was discovered by Giovanni Domenico Cassini in 1684, and is named after the titan Tethys of Greek mythology.
Tethys imaged by the Cassini orbiter, April 2015
Giovanni Domenico Cassini, discoverer of Tethys
Tethys—Trailing hemisphere—Standard processing (11 April 2015).
Tethys—Trailing hemisphere—Enhanced processing (11 April 2015).
Natural satellite
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A natural satellite is, in the most common usage, an astronomical body that orbits a planet, dwarf planet, or small Solar System body. Natural satellites are colloquially referred to as moons, a derivation from the Moon of Earth.
Size comparison of Earth and the Moon
Artist impression of Rhea's proposed rings