Mercury: Images of a Violent Planet

NASA's MESSGENGER spacecraft probes innermost planet in the solar system.

Mercury: Images of a Violent Planet

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This image taken by NASA's Messenger reveals some of Mercury's unique and distinctive features. On the upper right is the giant Caloris basin, including its western portions never before seen by spacecraft. Formed by the impact of a large asteroid or comet, Caloris is one of the largest, and perhaps one of the youngest, basins in the solar system. (Picture taken Jan. 14, 2008.) (REUTERS/NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington/Handout)
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