This image provided by NASA Tuesday Oct. 7, 2008 shows a close up photo of the surface of the planet Mercury taken taken on Oct. 6, 2008 when NASA's MESSENGER spacecraft flew by Mercury for the second time this year. MESSENGER is the first mission sent to orbit the planet closest to the sun. This portion of Mercury’s surface was previously imaged under different lighting conditions by Mariner 10, but this new MESSENGER image mosaic is the highest-resolution ever acquired of any portion of Mercury’s surface. The largest impact feature at the top of the image is about 133 kilometers (83 miles) in diameter and is named Polygnotus, after a Greek painter from the 5th century B.C. This basin has a central peak ring and is embayed with smooth plains material, which is very different in texture from the surrounding terrain.
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