causes the eye to use normal (scotopic) vision, which is of much higher quality than dark-adapted (photopic) vision.<br><br>Of the 1,940 named features on the Moon, 1,545 (nearly 80 percent) are craters. There are many more craters in the highlands than in the maria. The size range of craters is large, and some observers make it a personal challenge to see either (1) how small a crater they can see, or (2) how many small craters in a given area they can observe with a particular telescope. A detailed map of