why is the sky Blue

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The sky appears blue because of a phenomenon called Rayleigh scattering.

Sunlight, which appears white, is actually made up of many different co[lors of light, each with different wavelengths. When sunlight enters Earth's atmosphere, it interacts with gas molecules, dust, and other particles.

Shorter wavelengths of light (blue and violet) scatter more than longer wavelengths (red and yellow) because they are more easily absorbed and re-emitted by the air molecules. Although violet light scatters even more than blue, our eyes are more sensitive to blue light, and some of the violet is absorbed by the upper atmosphere. As a result, we perceive the sky as blue during the day.

At sunrise and sunset, the sun’s light has to pass through more of the atmosphere, scattering away the shorter wavelengths and allowing the longer red and orange wavelengths to dominate, which is why the sky appears reddish during those times.

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