Colors of the world around us

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This article/section is a stub — probably a pile of half-sorted notes, is not well-checked so may have incorrect bits. (Feel free to ignore, fix, or tell me)

Blue, which scatters more than the other frequencies in visible light (see a prism), therefore refracts into the atmosphere more easily than the other colors, illuminating it; this is roughly why the sky appears blue.

A very similar reason is the major factor in why sunsets appear red: the red end of the spectrum scatters least, which is why it is most likely to be left when it has to travel a long way through the atmosphere (or unusually warm (or polluted) air).

The scattering involved is not actually that simple. See this page if really interested.