Copernicus (lunar Crater)
Copernicus is a lunar impact crater named after the astronomer Nicolaus Copernicus, located in eastern Oceanus Procellarum. It is estimated to be about 800 million years old, and typifies craters that formed during the Copernican period in that it has a prominent ray system.
Read more about Copernicus (lunar Crater): Characteristics, Names, Satellite Craters