BABAK TAFRESHI / SCIENCE PHOTO LIBRARY BABAK TAFRESHI / SCIENCE PHOTO LIBRARY
Moon halo and La Silla Observatory. Panoramic image of a lunar halo in the night sky over one of the telescope buildings of La Silla Observatory in the Atacama Desert, Chile. La Silla is located at an altitude of 2400 metres and is operated by the European Southern Observatory (ESO). Lunar halos are an optical phenomena that form when moonlight passes through ice crystals in the sky, usually from cirrostratus clouds or fog.
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