Walker (Moon)

Named after Joseph Albert Walker - American test pilot (1921-1966).

Walker is a lunar crater that lies on the far side. It is located to the northwest of the huge walled plain Apollo. Walker lies equidistant. This crater is roughly circular, with an outer rim that has been slightly worn due to minor impacts. (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.