Earth's atmosphere is especially good at refracting blue light, which makes the sky blue.

Which gas or gasses is/are responsible for this?

If some gasses in the atmosphere do not refract blue light, what colors DO they refract?

Is it possible to have a breathable atmosphere with a non-blue sky?

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    $\begingroup$ please take a look here en.wikipedia.org/wiki/Rayleigh_scattering you have multiple questions here please edit your question so it focuses on only one of them. $\endgroup$ Sep 20 at 6:49
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    $\begingroup$ The simple answer to your question is "molecular nitrogen" since it is the majority of our atmosphere. But, calling this refraction is incorrect IMO; it should be called scattered light. $\endgroup$
    – f.thorpe
    Sep 20 at 23:32


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