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| Description: Callisto The outermost Galilean satellite is almost exactly the same size as Mercury. Numerous craters pockmark Callisto’s icy surface. (a) The series of faint, concentric rings that cover much of this image is the result of a huge impact that created the impact basin Valhalla. Valhalla dominates the Jupiter-facing hemisphere of this frozen, geologically inactive world Picture Stats: Views: 481 Filesize: 299.95kB Height: 900 Width: 749 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=16351 |