Mach (Moon)

Named after Ernst Mach - Austrian physicist, philosopher (1838-1916).

Mach is a large lunar crater of the class known as a walled plain. It is located on the far side and cannot be viewed directly from the Earth. Nearby craters of note include Joule to the northeast, Mitra attached to the western outer rim, and Henyey to the southwest. This is a prominent but eroded formation with multiple craters along the rim and interior. (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.