Blue sky phenomenon

The blue sky phenomenon occurs because molecules in Earth's atmosphere scatter sunlight. This scattering, called Rayleigh scattering, affects shorter wavelengths of light—like blue—more strongly than other colors. As sunlight passes through the atmosphere, blue light is scattered in all directions and dominates our line of sight, giving the sky its characteristic blue color during the day. This process depends on factors like the amount of particles in the air and the angle of the sun. Essentially, the blue sky is the result of Earth's atmosphere selectively dispersing blue wavelengths of sunlight.