Lunar rays

Lunar rays

Fig. 5.14 . White rays splash out across the Moon from crater Tycho (bottom). Tycho is a large, young crater with a diameter of 85 kilometers and an age of 107 million years. Only relatively recent craters retain their white rays, for those of older craters are darkened and worn away by continued meteorite impact. The dark, flat circular feature in the upper right is Mare Nectaris (Sea of Nectar). This clear image was produced using the unsharp masking technique that permits high contrast and fine resolution. (Anglo-Australian Telescope 1976. Photo prepared by David F. Malin.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University