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  1. Corona (optical phenomenon) - Wikipedia

    • In meteorology, a corona (plural coronae) is an optical phenomenon produced by the diffraction of sunlight or moonlight (or, occasionally, bright starlight or planetlight) by individual small water droplets and sometimes tiny ice crystals of a cloud or on a foggy glass surface. In its full form, a corona consists of several concentric, pastel-colored rings around the celes… See more

    Pollen coronae

    Pollen suspended in the air can also cause diffraction of sunlight that produces coronae. Because pollen grains … See more

     
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