In this image, Mercury's cratered surface stretches to the horizon. Limb images with the Wide Angle Camera (WAC) have been a part of MDIS imaging campaigns since the beginning of orbital operations. A few months ago, in June 2012, NAC images of Mercury's limb were added to the regular weekly observations, resulting in a few images each week with dramatic views of Mercury's horizon such as seen here. View this previous post to see a stunning mosaic of NAC limb images.
Date acquired: July 17, 2012
Image Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington