Molecules in the atmosphere scatter light coming from the sun, with the different colours that make up white light getting scattered different amounts. The blue light is scattered more and that’s what we see.
Exactly what Sam Said! If you imagine the molecules in the atmosphere like a prism, which scatters light of all colours when white light goes through it. Now, if you imagine that white lights goes through the molecule (prism), and you get a tiny bit of red, some green but mostly blue, then, you end up seeing only blue. This is actually what happens!
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