Area of Mercury newly seen during MESSENGER's 3rd flyby

Area of Mercury newly seen during MESSENGER's 3rd flyby
Area of Mercury newly seen during MESSENGER's 3rd flyby The red line outlines the five percent of Mercury's surface not before imaged by spacecraft. MESSENGER gathered high-resolution images of this region on approach to its third flyby, on September 29, 2009. NASA / JHUAPL / CIW