The dark side of Tethys is illuminated by reflected light from Saturn in this image from the Cassini orbiter. On the sunlit side, the giant Odysseus crater can be seen straddling the western edge. The crater is 280 miles across in its entirety, taking up a large portion of the 660-mile-wide moon’s icy surface.

Cassini was approximately 493,000 miles from Tethys when this photo was taken.

Image credit: NASA/JPL/Space Science Institute