Langevin (Moon)

Named after Paul Langevin - French physicist (1872-1946).

Langevin is a crater on the far side. It is located to the east of the walled plain Campbell, and to the west of the crater Chandler. This is a heavily damaged crater that has been worn and battered by multiple overlapping impacts. Apart from the depression Langevin creates in the surface, it is scarcely distinguishable from the surrounding terrain. (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.