Astronomy Picture of the Day

Tycho and Copernicus: Lunar Ray Craters

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#68925 by @ 06.03.2005 00:00 - nach oben -
Tycho and Copernicus: Lunar Ray Craters


Dazzling in
or a small telescope, the
Moon is
pocked with impact craters.

During partial
, 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.

This detailed
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.

Crater Copernicus,
surrounded by dark mare which contrast
nicely with its bright rays, is 93 kilometers in diameter.

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#68945 by @ 06.03.2005 15:18 - nach oben -
Was heisst wohl "jüngster grosser Krater", wie alt ist der ungefähr?