Why is the sky blue? What is the mechanism that cause the sky to look blue?
Excellent question! The sky is blue due to the reflective properties of particles in the upper atmosphere. The light from the sun contains colors all across the visible spectrum. However, the particles in the upper atmosphere bend the light in a similar way as a prism or a raindrop. The blue light bends the most, and so it is spread quite a ways away from the image of the sun. The other colors pretty much remain direct. For that reason, the color of the sun is often more yellow/reddish because the blue has been scattered to the rest of the sky.
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