Photos: Messenger returns to Mercury

October 7, 2008 11:52 AM PDT
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Machaut, the largest crater in this photo, is about sixty miles wide and contains a smooth surface shows that indicates it has been covered by lava flows. The floor of one of the two large craters within Machaut appears to have been covered with lava but the other large crater was formed at a later time as it sinks below the lava surface.

Photo by NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington

Caption by Andy Smith

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