The sky appears orange-red in the evening (and also during sunrise) due to a phenomenon called Rayleigh scattering. This occurs when sunlight interacts with molecules and small particles in the Earth's atmosphere, scattering the sunlight in all directions. The color of the sky depends on the wavelengths of the light that are scattered most effectively. In the evening, as the Sun approaches the horizon, the sunlight has to pass through a thicker layer of the atmosphere. As it travels through a more extended path, most of the shorter wavelengths (violet, blue, and green) are scattered out of view. The longer wavelengths, like red and orange, are scattered less and are more likely to reach our eyes. This is why the sky appears orange-red during sunrise and sunset.
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