Chadwick (Moon)

Named after Sir James Chadwick - British physicist (1891-1974).

Chadwick is a lunar crater that lies on the far side 's surface, just beyond the southwestern limb. It is located to the northwest of the crater De Roy, and was previously designated De Roy X before being given its current name by the IAU. This region of the lunar surface lies at the southern end of the ejecta blanket that surrounds the Mare Orientale impact basin. Chadwick is roughly circular with a sharp-edged rim. (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.