History of Valhalla

	Revision 8 . . November 23, 2001 11:17 am by Bryan Derksen [Callisto's biggest crater]
	Revision 7 . . August 18, 2001 5:21 pm by Sjc

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Difference (from prior major revision) (no other diffs)

Added: 2a3,6

The largest impact crater on Jupiter's moon Callisto. Valhalla has a bright central region 600 km across, and concentric rings extending to a diameter of approximately 3000 km around that.