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Iridescent polar stratospheric clouds hang over the Norwegian town of Tromsø on Dec. 16 -- a phenomenon that can be fleeting, but very beautiful. | Credit: Truls Tiller. Used with permission.
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Psychedelic High-Altitude Clouds Dazzle Arctic Circle

As the Arctic descends into 24 hour darkness, a strange iridescent phenomena popped up over a Norwegian town.

December 18, 2015
12:46 PM EST
Credit: Truls Tiller. Used with permission.