Question

Q4. Why does the sky appear dark to the passengers flying at very high altitudes​

Answer 1

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Scattering of light takes place because of the particles present in the atmosphere. At high altitude due to the absence of atmospheric scattering of light do not take place and hence sky appears dark to passengers flying at high altitude.

Answer 2

Explanation:

There is no atmosphere at very high altitudes, so scattering of light does not take place. So, the sky appear dark to the passengers flying at very high altitudes.