Geiger (Moon)

Named after Johannes Hans Wilhelm Geiger - German physicist (1882-1945).

Geiger is a lunar crater on the far side. It lies to the southwest of the much larger walled plain Keeler, and slightly farther to the northeast of the huge walled plain Gagarin. To the south is the crater Cyrano. This is a not-quite symmetrical crater formation with small outward bulges along the north and northeast. (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.