Menzel (Moon)

Named after Donald Howard Menzel - American astrophysicist, Smithsonian researcher (1901-1976).

Menzel is a tiny lunar impact crater located in the southeast of the Mare Tranquillitatis. This feature is circular in outline and cup-shaped, with no overlapping impacts of significance. The mare around the crater is nearly devoid of features of interest, except for a nearly submerged crater rim to the northwest, and a few small rises to the north and east. (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.