Why is sky blue?

The sky appears blue because of a phenomenon called Rayleigh scattering. When sunlight enters Earth's atmosphere, it encounters molecules and tiny particles in the air. These particles scatter the sunlight in all directions. However, the shorter blue and violet wavelengths of light are scattered more than the longer red and orange wavelengths. This scattering of shorter wavelengths is more effective in all directions, which is why the sky appears blue to our eyes.

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