Their contrasts are related, in large part, to their sizes. Tethys (660 miles across) is large enough to be spherical and to have varied geology, like chasms and smooth plains, along with some puzzling arc-shaped features (see PIA19637 http://photojournal.jpl.nasa.gov/catalog/PIA19637) ...
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Tethys (660 miles or 1,062 kilometers across) appears above the rings, while Enceladus (313 miles or 504 kilometers across) sits just below center. Mimas (246 miles or 396 kilometers across) hangs below and to the left of Enceladus. This view looks toward the sunlit side of the rings from about 0.4 degrees above the ring plane. The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Dec. 3, 2015.
The view was acquired at a distance of ~837,000 miles from Enceladus, with an image scale of 5 miles per ...
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