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What makes the sky and the blue?

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Anonymous

12y ago
Updated: 1/23/2023

The blue color of the sky is due to Rayleigh scattering. The the shorter wavelengths (blue) in the white light from Sunlight are absorbed by the gas molecules in the air. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky. Whichever direction you look, some of this scattered blue light reaches you and you see the blue light from everywhere overhead making the sky look blue.

The same principle makes the sea look blue.

At sunset the light must travel farther through the atmosphere before it gets to you. More of the blue light is reflected and scattered and the only the longer wavelengths (red) are left in the direct beam that reaches your eyes, making the setting sun red.

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Lenora Corkery

Lvl 10
2y ago

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