... This detailed digital close-up of the full Moon features two prominent ray craters , Copernicus (upper left) and Tycho (lower right), each with extensive ray systems formed of light colored debris blasted out by the crater-forming impacts. In general, ray craters are relatively young as their rays overlay the lunar terrain . ... Publications with keywords: ray crater - crater - Copernicus - Tycho crater - Moon . Publications with words: ray crater - crater - Copernicus - Tycho crater - Moon . ...