In the lower center of this NAC (Narrow Angle Camera) image, a scarp cuts through two craters (blue arrows). The fact that the scarp transects the craters indicates that it formed after the two crater-forming impact events. Many similar scarps, referred to as rupes, have been identified on Mercury, and rupes are believed to have formed when the interior of Mercury cooled and the planet shrank slightly. The white stripe that cuts diagonally across (red arrows) is part of a system of rays emanating from a bright, relatively young crater to the north. This impressive ray system extends for large distances over Mercury's surface.