What causes the dramatic orange and red colors observed during sunsets?

Answer

The light travels through a vastly greater amount of atmosphere, scattering away almost all short-wavelength light

During sunset, the light path is long, causing almost all blue and violet light to be scattered away from the direct line of sight, leaving the observer to see primarily the remaining longer wavelengths, such as orange and red.

What causes the dramatic orange and red colors observed during sunsets?

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