Why is the sky blue?
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Why is the sky blue?
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Answer:
The sky looks blue but really it is made up of all the colours of the rainbow. Each of these colours has a different wavelength. Some of these are smoother while others are choppy. Blue light waves travel in short, choppy waves. Like each of the other colours, blue light waves are scattered and reflected as they enter Earth's atmosphere and collide with gases and other particles. Because the colour blue has the shortest wavelength, it collides with nearly everything in its path and is scattered about the sky. This is why the sky appears blue.
Nitrogen, which makes up 78 percent of Earth's atmosphere, is the gas that blue light mostly collides and reflects off of as it makes its way toward Earth. If not for nitrogen and the short wavelength of the colour blue, the sky might be a different colour.