Question

Sky appears dark instead of blue to an astronaut in space.​

Answer 1

it is because atmosphere is not there hence no scattering occurs.

so it is dark.

Answer 2

Explanation:

The sky appears dark instead of blue to an astronaut because there is no atmosphere in the outer space that can scatter the sunlight. As the sunlight is not scattered, no scattered light reach the eyes of the astronauts and the sky appears black to them.