Wallace (Moon)

Named after Alfred Russel Wallace - British natural historian (1823-1913).

Wallace Crater is an impact crater in the Hellas quadrangle on Mars at 52.9°S and 249.4°W and is 173.0 km in diameter. (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.