Mercury/Craters

Craters caused by impacts on Mercury. The transitional diameter of craters (10-12 km) between simple (bowl-shaped) and complex craters (central peaks and ridges) is twice that of Mars, despite the fact that surface gravity at both planets are roughly the same. The fact that the average impact speed is 2-3 times greater than that of Mars may be a contributing factor.

Transition Diameters of Craters is Twice that of Mars (Jul 2011)

 * http://messenger.jhuapl.edu/soc/highlights.html