Why is the sky blue?
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The white light of the Sun consists of many wavelengths. When seen separately, each wavelength corresponds with a different color. The air molecules and particles of matter that make up Earth’s atmosphere scatter some of the Sun’s light as it travels to Earth, especially the shorter wavelengths that give us the color blue. Coming to us from all angles in the sky, these light waves make the sky appear blue.
The sky is blue because of a phenomenon called Rayleigh Scattering, which is the scattering of light by small particles or molecules in the atmosphere.