BABAK TAFRESHI / SCIENCE PHOTO LIBRARY BABAK TAFRESHI / SCIENCE PHOTO LIBRARY
Night sky over Canyonlands National Park. Panoramic image of green airglow in the night sky over Canyonlands National Park, Utah, USA. Airglow is a faint emission of light by a planetary atmosphere that occurs when atoms and molecules in the upper atmosphere, excited by sunlight, emit light to shed their excess energy.
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