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A very simple question, who will answer it. The blue sky that we see, where is it?
And the answer of your question is:-
Actually in reality sky isn't blue, it's real color is black. But in the day, it looks blue because when sunlight strikes the ozone layer, it turns blue and due to that we see blue sky.
The real sky is in the universe, over the earth somewhere. Well that's not clearly known to us humans yet. May be NASA has made some breakthrough and may have had some answers.
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