Geological Chronicle
Located on the lunar far side, Ley is an impact crater measuring 81.05 kilometers across. The formation lies across the southern rim of the walled plain Campbell. To the south-southwest, the slightly larger crater Von Neumann intrudes into Ley's perimeter, having deposited a bulging rampart of debris that occupies the southwestern section of its interior floor.
Impact erosion has worn Ley's outer rim and inner wall, leaving both marked by small craters. Its interior floor is pockmarked with small impacts, including a cup-shaped crater northwest of the midpoint. Known as Crater 59 prior to formal naming, the feature was designated Ley by the International Astronomical Union in 1970 in honor of German-American rocketry scientist Willy Ley.