Valhalla Crater
This close up of Callisto shows the heavily cratered surface and the prominent ring structure known as Valhalla. It was acquired by Voyager 1 on March 6, 1979. Valhalla's bright central area is about 300 kilometers across with sets of concentric ridges extending out to 1,500 kilometers from the center.
Image: Copyright Calvin J. Hamilton [high-resolution]
Caption: Solarview.com/Calvin J. Hamilton