The sky appears blue due to a process called Rayleigh scattering. As light moves through space, it will move in a straight line as long as there is nothing to get in its way, like molecules or dust/water particles. If light hits dust/water particles, it bounces off the particle and “scatters.” If light hits a gas molecule, some of the light may be absorbed.
When light moves through the atmoshpere, colors with longer wavelengths (red, yellow, orange) will pass straight through, but blue light gets absorbed by the gas molecules. The molecules will then radiate the absorbed blue light in different directions across the sky, making the sky appear blue.
because it just is
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