Figure 13-17: R I V U X G
Callisto Numerous craters pockmark Callisto’s icy surface. The inset shows a portion of a huge impact basin called Valhalla. Most of the very smallest craters in this close-up view have been completely obliterated, and the terrain between the craters is blanketed by dark, dusty material.
(Left: Arizona State University/JPL/NASA; right: JPL/NASA)