Trumpler (Moon)

Named after Robert Julius Trumpler - American astronomer (1866-1956).

The first image below shows the relationship among three craters that are near each other. Keeler Crater is to the North Crater. After Keeler was formed, a later impact formed Trumpler Crater, and in the process destroyed part of Keeler. (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.