Green aurora light behind kirkjufell mountain in Iceland, Europe. Courtesy of NASA

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Photo credit: © Ivan Kmit / Alamy / Afripics
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Keywords: astronomy, aurora, borealis, calm, cold, color, green, hills, iceland, kirkjufell, kirkjufellfoss, lake, landscape, light, lights, magical, mountain, nature, night, northern, outdoor, phenomenon, polar, sky, travel, water, waterfall