50.1 MB (3.1 MB compressed)
3417 x 5125 pixels
29.0 x 43.4 cm ⏐ 11.4 x 17.1 in (300dpi)
DR JUERG ALEAN / SCIENCE PHOTO LIBRARY DR JUERG ALEAN / SCIENCE PHOTO LIBRARY
Lunar halo. Halo formed in cirrostratus clouds around a full moon. This atmospheric optical phenomenon is caused by prismatic refraction of moonlight through randomly-oriented hexagonal ice crystals in the atmosphere. Photographed over the town of Pontresina, Grisons, Switzerland.
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