The sky appears blue because of a phenomenon called Rayleigh scattering, which is the scattering of light by small particles or molecules in the atmosphere.
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Sky's blue colour
The shorter, blue wavelengths of light are scattered more than the longer, red wavelengths, resulting in the blue color we see in the sky.
Image credits: Freepik
Sky's blue colour
Sunlight enters Earth's atmosphere and is made up of a spectrum of colors. The smaller molecules of gases such as nitrogen and oxygen in the atmosphere scatter the light.
Image credits: Freepik
Sky's blue colour
The blue light is scattered more than the other colors because it travels as shorter, smaller waves.
Image credits: Freepik
Sky's blue colour
This scattered blue light reaches our eyes from all directions, giving the sky its blue appearance.
Image credits: Freepik
Sky's blue colour
The sky can appear more red during sunrise and sunset due to the scattering of light by atmospheric particles.