The sky appears dark instead of blue to an astronaut due to

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Refraction of light

Reflection of light

Scattering of light

None of these

answer is C.

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Detailed Solution

The sky appears dark instead of blue to an astronaut due to Scattering of light.
The blue colour of the sky is due to the scattering of light from the atmosphere. The darker colour is nothing but the absence of light. The sky appears darker than blue to an astronaut because there is no atmosphere in outer space that can scatter sunlight. As the sunlight is not scattered, no scattered light reaches the eyes of the astronauts, so the sky makes them appear black.

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