Although Dione (near) and Enceladus (far) are composed of nearly the same materials, Enceladus has a considerably higher reflectivity than Dione. As a result, it appears brighter against the dark night sky as seen by NASA's Cassini spacecraft.
Why does Saturn look like it's been painted with a dark brush in this infrared image, but Dione looks untouched? NASA's Cassini spacecraft took this image in a wavelength that is absorbed by -- methane.
This view from NASA's Cassini spacecraft looks toward Saturn's icy moon Dione, with giant Saturn and its rings in the background, just prior to the mission's final close approach to the moon on August 17, 2015.
Some parts Dione's surface are covered by linear features, called chasmata, which provide dramatic contrast to the round impact craters that typically cover moons. This image was captured by NASA's Cassini spacecraft.
This set of global, color mosaics of Saturn's moon Dione taken by NASA's Cassini spacecraft during its first ten years exploring the Saturn system; obvious feature on the maps is the difference in color and brightness between the two hemispheres.
As seen by NASA's Cassini spacecraft, the surface of Dione is covered in craters, reminding us of the impacts that have shaped all of the worlds of our solar system; the surface also bears linear features that suggest geological activity in the past.
Although the crack-like features seen here on Dione's surface appear wispy and faded, they are in reality a series of geologically fresh fractures as seen in this images captured by NASA's Cassini spacecraft.
This image, taken by NASA's Cassini spacecraft, shows Dione's twin craters Romulus and Remus (just above-right of center), like their semi-divine namesakes, standing together. Also seen is Dido, the larger crater featuring a central peak.
The famed wispy terrain on Saturn's moon Dione is front and center in this recent image captured by NASA's Cassini spacecraft. The 'wisps' are fresh fractures on the trailing hemisphere of the moon's icy surface.