Mercury's south pole

Mercury

. In this Mariner 10 frame, south is down and the south pole is located on the right-hand edge of the large crater that has only its rim sticking up into the light. Radar reflection data suggest that water ice might be present in the cold, dark, permanently shadowed floors of craters at the poles of Mercury. (Courtesy of JPL and NASA.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University