There is a marked contrast between the crater Archimedes and the smaller Aristullus (to the north-east) and Autolycus (to the east). Its smooth floor reveals that it has been flooded, thus despite its considerable diameter it is little more than half as deep as its yourger neighbours.

Photo: Thierry Legault. The full size original of this and other high definition lunar images may be seen at his High Resolution CCD Imaging site.