NASA's Cassini spacecraft captured this view of Saturn's moon Enceladus that shows wrinkled plains that are remarkably youthful in appearance, being generally free of large impact craters. (astronomynow.com)
Clays also tend to be found in and around large impact craters, where material from deep below the surface has been excavated. (sciencedaily.com)
Scientists are interested in dune fields isolated within large impact craters because their dark color suggests that the dust covering much of the rest of the planet does not accumulate there. (scientificamerican.com)