Hausen is a large lunar impact crater that lies along the south-southwestern limb. The visibility of this crater is significantly affected by libration effects, although even under the best of conditions it is viewed nearly from on edge. It lies along the western edge of the immense walled plain Bailly. To the northeast is the crater Pingré on the near side, and to the north is the Arrhenius just on the far side of the lunar limb. (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.