Why is the sky blue?
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Sunlight reaches Earth’s atmosphere and is scattered in all directions by all the gases and particles in the air. Blue light is scattered more than the other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time.
The sky is blue because sunlight is scattered by molecules in the atmosphere of Earth. This phenomenon is known as Rayleigh scattering. Blue light has shorter wavelength and hence, it gets scattered easily.