Tethys: large crater PIA01398
Special processing has brought out surface detail in this Voyager 2 image focusing on the large crater on Tethys. The spacecraft took this photograph Aug. 25, when it was 826,000 km from the icy moon of Saturn.

Here, resolution is about 15 km. The crater has been flattened by the flow of softer ice and no longer shows the deep bowl shape characteristic of fresh craters in hard, cold ice or rock. It appears to have been formed early in in Tethys' history, at a time when its interior was still relatively warm and soft.
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Image Credit: JPL, NASA