Page 51 - Curriculum Visions Dynamic Book

Light-coloured rays around craters are made by ejected material hitting the lunar surface. They lead us to think that craters with rays are much younger than those without.
Over huge periods of time the effects of gravity collapse some parts of the rims, producing a stepped, or terracelike edge. At the same time, material thrown from other impact craters gradually obliterates the rays of older craters.
 An angled view of the Crater Daedalus on the lunar far side as seen from the Apollo 11 spacecraft in lunar orbit. The view looks southwest. Daedalus has a diametre of about 80 kilometres. This is a typical scene showing the rugged terrain on the far side of the Moon.
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