why does the moon have a large ring around it..in a perfect cicle..and whats...

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POWERBOX

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...its cause and called? thanks..its beautifull...
it looks like a giant perfect ring...way out from it...is it like a magnetic field or something????
 
many materials refract light at a particular angle due to their composition or structure. With ice crystals its like 20 degrees or something...

If you draw a line from your eye to the ring, you will see a 20 degree bend from there to the Moon... as this angle is the same all around the Moon, we see a ring.

Sometimes, for different materials, like fog, rain... you can see three rings at once.
 
That ring is caused by high-altitude ice crystals in our atmosphere. You'll sometimes see the same effect around the sun. Often such a ring means that wet weather is on the way.
 
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