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Tethys (moon) facts for kids

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Tethys cassini
Photo taken by Cassini-Huygens.

Tethys (pronounced TEE-this) is a large moon of the planet Saturn.


It was discovered by Giovanni Domenico Cassini in 1684. It was one of the first Saturnian moons discovered.

Physical characteristics

Mass, density and volume

Tethys' mass is 617,551,805,221,061,000,000 kg, its density is 0.973 g/cm3 and its volume is 634,264,255 km3.

Craters and valleys

It has a very large crater on its surface, called Odysseus. It is named after a Greek warrior king in Homer's two great works, The Iliad and The Odyssey. There is also a very long valley called Ithaca Chasma. It is 100 km wide and 2000 km long.

Orbit and rotation

Tethys takes 45.3 hours to orbit (go around) Saturn and orbits Saturn 294,660 km away. Tethys is tidally locked in phase with its parent planet - one side always faces toward Saturn.

Images for kids

See also

Kids robot.svg In Spanish: Tetis (satélite) para niños

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