Topography of Mercury’s Northern Hemisphere

NASA's Messenger spacecraft mapped the topography of Mercury's northern hemisphere
, as seen in this enhanced color mosaic which shows (from left to right) Munch (61 km/38 mi), Sander (52 km/32 mi), and Poe (81 km/50 mi) craters, all located in the northwest portion of the Caloris basin. The smooth volcanic plains that fill the Caloris basin appear orange in this image. All three craters are superposed on these volcanic plains and have excavated low-reflectance material, which appears blue in this image, from the subsurface. (Credit- NASA)