Lyman (Moon)

Named after Theodore Lyman - American physicist (1874-1954).

Lyman is a lunar impact crater that lies in the southern hemisphere on the far side. It is located to the south of the huge walled plain Poincaré, and to the northeast of Schrödinger, another walled plain. To the east-southeast is the larger crater Minnaert. The rim has not been significantly worn and has a well-defined edge and interior features that have not been eroded through impacts. (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.