Question

why does sky appears dark instead of blue to an astronaut?​

Answer 1

This is because in outer space, there is no atmosphere to scatter sunlight. since there is no scattering of blue components of white sunlight which can reach the eyes of an astronaut in outer space,therefore,the sky appears dark to the astronaut,instead of blue.

Answer 2

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the sky appears blue to us due to the scattering of blue colur of white light by atmospheric refraction.Since,there is no atmosphere to in the space to scatter white light.Thus, the sky appears dark instead of blue to the astronaut.

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