The dunes on Saturn’s moon Titan may be composed of the remains of smaller moons that once collided with each other and turned into sand.
Titan has sand dunes that cover about 17 percent of its surface and are spread throughout its equatorial region. Many researchers suggest that this sand may be made up of organic particles that form in Titan’s thick atmosphere and then fall to the surface. However, in laboratory experiments…
Source: www.newscientist.com