Millikan (Moon)

Named after Robert Andrews Millikan - American physicist; Nobel laureate (1868-1953).

Millikan is a lunar impact crater in the northern hemisphere 's far side. It is located to the north of the crater H. G. Wells, and to the southwest of von Békésy. The rim edge is roughly circular and well-defined, but with some irregularities. There are some small outward bulges along the south and east where the edge has slumped inwards somewhat. (wikipedia entry)

A crater is a circular depression likely created by an impact event. On the Moon they are named after deceased scientists, polar explorers, astronauts or cosmonauts.