Rough highlands and smooth maria on the Moon

Rough highlands and smooth maria on the Moon

Fig. 5.10a . The heavily cratered lunar highlands are illustrated in this Apollo 17 image of the Van de Graaff crater. It is located on the far side of the Moon, at the northeast edge of Mare Ingenii. This unusual crater formation seems to be composed of two merged craters with no intervening rim, and the surrounding region is saturated with craters upon craters formed during an intense bombardment of the Moon about 3.9 billion years ago. Lunar volcanism is seen frozen into place in an Apollo 15 image of Mare Imbrium, the Sea of Rains (Figure 5.10b). (Courtesy of NASA.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University