Caption: 
SwRI and the University of Arizona studied centimeter- to meter-sized craters on boulders scattered around the surface of the near-Earth asteroid Bennu. This composite shows the cascading rim of an ancient crater from the time Bennu resided in the asteroid belt. The overlaid colors highlight the topography of the boulder with warmer colors indicating higher elevations. 

Credit: 
Courtesy of University of Arizona/Johns Hopkins APL/York University 