300 Kilometer Long Scarp

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A scarp, or cliff, more than 300 kilometers (185 miles) long extends diagonally from upper left to lower right in this Mariner 10 picture (FDS 166842) of Mercury taken on September 21. Numerous similar structures have been discovered by Mariner 10 during the television sequences on the spacecraft's second flyby of the planet. These structures are believed to be formed by the compressive forces due to crustal shortening. The picture was taken from 64,500 kilometers (40,000 miles). Posted on: 17 Mar, 2003