Question

4
In what colour does the sky appear for an astro-
naut?
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Answer 1

The sky appear dark (or black) to an astronaut instead of blue because in the outer space there is no atmosphere which contains air due to which there is no scattering of light takes place. And when there is no scattered light to reach our eyes in outer space, therefore the sky looks dark and black there.

Answer 2

The sky appears blue when the scattering of light takes place. As there is no atmosphere in space and hence light does not scatter into its constituent colors that is why the sky appears dark instead of blue to an astronaut in space.