Diderot (Moon)

Named after Denis Diderot - French philosopher (1713-1784).

Diderot is a small lunar impact crater on the far side. It lies within the southwestern interior floor of the huge walled plain Fermi, about midway. The crater is saucer-shaped, with smaller craters located just to the northwest and the north. The inner wall is narrower along the eastern side, and has a pair of ridges along the southern face. (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.