Tethys is Saturn’s fifth-largest moon and is thought to be composed of mostly water ice along with a small amount of rock. Interestingly, Tethys has gravitationally locked two smaller moons into its own subsystem: Telesto and Calypso.
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Tethys is Saturn’s fifth-largest moon and is thought to be composed of mostly water ice along with a small amount of rock. Interestingly, Tethys has gravitationally locked two smaller moons into its own subsystem: Telesto and Calypso.