The sky appears dark to passengers flying at very high altitudes mainly because

Foundation

Physics Foundation

Human Eye And Colorful World

Question

The size of molecules is smaller than the wavelength of visible light

There is no atmosphere at great heights

Scattering of light is not enough at such heights

The light gets scattered towards the earth

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Explanation : The sky appears dark to passengers flying at very high altitudes mainly because the scattering of light takes place due to the particles present in the atmosphere. At a higher altitude, the atmospheric medium is very rarer so the scattering of light taking place is very low. Hence, the sky appears dark to passengers flying at high altitudes.