Iapetus, has two different kinds of surfaces and terrain's. One half of the moon is very bright, and heavily cratered. The other half of the moon has one of the darkest surfaces in the solar system.

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Tethys is an icy body that is made of almost entirely of water ice. Tethys is very cold in fact it is about -305° Fahrenheit or -187° Celsius. Tethys has an enormous trench named Ithaca Chasma that is several kilometers deep and about 40 miles or 65 kilometers wide. It is so long that it covers three-fourths of Tethys' circumference. Another big feature Tethys has is an enormous 400 Kilometer impact crater named Odysseus.

Tethys was discovered by Giovanni Cassini in 1684.