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Have you ever looked up at a stunning blue sky and wondered why its hue was blue? That isn’t surprising as sky color results from complex interactions among air molecules. Simple explanation: Because oxygen and nitrogen molecules are significantly smaller than light wavelengths, they scatter it more strongly resulting in blue light being scattered more…

As sunlight passes through the atmosphere it gets refracted or scattered by air molecules; light nearer the blue end of the spectrum tends to get scattered more than other colors, giving a blue hue to the sky. At sunrise and sunset, light traveling through longer distances in the atmosphere becomes less scattered, allowing more red…