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 color imaging ever acquired of any portion of Mercury's surface from its Oct. 6, 2008 flyby. The largest impact feature at the top of the image is about 133 kilometers (83 miles) in diameter and is named Polygnotus. Credit: NASA/JHUAPL/CIW.
