Schwarzschild is a large lunar impact crater that is located in the northern part 's far side. The nearest craters of note are Seares to the northeast, and Gamow to the southeast. The somewhat irregular outer rim has been overlain by many smaller impact craters, including most notably Schwarzschild K across the southeastern face and Schwarzschild D on the northeastern rim. The rim is roughly circular in form, with an outward bulge along the southwestern side. (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.