The blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air.
However, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky. Whichever direction you look, some of this scattered blue light reaches you. Since you see the blue light from everywhere overhead, the sky looks blue.
It has to do with the atmosphere. Light is made up of colors, and each color has its own wavelength, with blue having a shorter wavelength than red or orange. While red, yellow, and orange light are generally unaffected by air, blue light gets absorbed by the gas molecules in the atmosphere and then gets radiated in all directions, which leads to the effect of a blue sky.
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