A ring of light encircling and extending outward from the sun or moon is called a halo.The most common type of halo is the 22 halo- a ring of light 22 from the sun or moon. A halo froms when tiny suspended column-type ice crystals become randomly oriented as air molecules constantly bump against them. The refraction of light rays through these crystals forms a halo. A halo usually seen as a bright, white ring ,but there are refraction effects that can cause it to have color.
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