Physics
When the Sun is near the horizon during the morning or evening, it appears reddish. The phenomenon that is responsible for this observation is
Reflection of light
Refraction of light
Dispersion of light
Scattering of light
Scattering of light
The red colour in the sky at sunset (and sunrise) is due to an effect called Rayleigh scattering. There is a similar form of scattering called Mie scattering which is responsible for the white colour of clouds.
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