This is an image of Tethys.
Click on image for full size
The Surface of Tethys
The surface of Tethys has many craters, which means that the surface is very old and hasn't been changed.
But there is one region of Tethys which doesn't have many craters at all. The fact that there are no craters in one region may be a sign that in the past, there was some activity on Tethys which changed the surface.
There are also several trenches across the surface. These are further signs of changes in the past.
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