Chasms on Dione

Explanation: Saturn's moon Dione, like Pluto's moon Charon, also has chasms, but they take a very different form. The image was taken in visible light with the Cassini spacecraft narrow-angle camera on April 11, 2015. The bright network of fractures on Dione (698 miles or 1123 kilometers across) was seen originally at poor resolution in Voyager images and was labeled as "wispy terrain." The nature of this terrain was unclear until Cassini showed that they weren't surface deposits of frost, as some had suspected, but rather a pattern of bright icy cliffs among myriad fractures. One possibility is that this stress pattern may be related to Dione's orbital evolution and the effect of tidal stresses over time.


Image credit: NASA/JPL-Caltech/Space Science Institute