Nacreous clouds. Very rare phenomenon on an extreme altitude of 15-25 kilometers. That high up the clouds freeze and shimmer in many different colors when light passes through them. What a lovely Christmas at my home, Northern Sweden. (4192x2358) via /r/EarthPorn http://ift.tt/2l8oesv
via Tumblr http://ift.tt/2BPuEYE
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