or a small telescope, the
pocked with impact craters.
phases, the craters along the terminator
are cast in dramatic relief by strong shadows.
But when the
Moon is full some
craters seem to sprout systems
of bright radial lines or rays.
close-up of the full Moon features two
prominent ray craters,
Copernicus (upper left) and Tycho (lower right),
each with extensive ray systems 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.
In fact, at 85 kilometers wide, Tycho, with its far reaching rays,
is the youngest large crater on the nearside.
surrounded by dark mare which contrast
nicely with its bright rays, is 93 kilometers in diameter.