File:Valhalla crater on Callisto.jpg

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Horizontal resolution	96 dpi
Vertical resolution	96 dpi
Software used	paint.net 4.0.5
User comments	CALLISTO 10 March 1995 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 km across with sets of concentric ridges extending out to 1,500 km from the center. Credit: Calvin J. Hamilton, and NASA.