LAURENT LAVEDER / SCIENCE PHOTO LIBRARY LAURENT LAVEDER / SCIENCE PHOTO LIBRARY
Lunar corona around a gibbous Moon. This phenomenon is caused by the diffraction of the moonlight by water droplets or ice crystals in the air. Coronas are produced by high thin clouds, and are much smaller than other optical phenomena such as halos. This corona is also showing rainbow-like fringing effects. A gibbous Moon is one that is between the half-full and full phases.
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