Why the Sky Is Blue
EVERYDAY PHYSICS · light playing pinball
Sunlight is a mix of all colors, and air molecules knock the blue part around far more than the rest, scattering it across the whole dome of the sky. That scattered blue is what you see in every direction. At sunset the light takes a long, low path through the air, the blue gets scattered away before reaching you, and what survives is gold and red. Same physics, two beautiful results.
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