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The sky appears blue due to a phenomenon called Rayleigh scattering. When sunlight enters Earth's atmosphere, it collides with gas molecules. Shorter wavelengths of light (blue and violet) scatter more than longer wavelengths (red and orange). ^[1]

Although violet light scatters even more than blue, our eyes are more sensitive to blue light, and some violet light is absorbed in the upper atmosphere. This combination makes the sky appear blue rather than violet. ^[2]