Question

Why does the sky appear dark instead of blue to an astronaut

Answer 1

there is no atmosphere in space so the dispersion effect of light and the color spectrum never occur.

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.