We are already back in Nassau, but a few days ago we saw something rare during a whale watching tour in Tromsø: stratospheric clouds (supposedly of type 2, i.e. water/ice clouds).
They are quite easy to recognize due to their rainbow colors, which brings me to this question: Why are clouds in the stratosphere so colorful but the usual clouds in the troposphere just black and white?
I think I have an answer, but I would prefer to hear an opinion from readers first ...
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