Question

what would the sky look like on a planet without any atmosphere?

Answer 1

without atmosphere we will directly able to see the black space up their. think of moon. when astronaut visited there they saw the earth directly.  like that we would be able to see the stars and other planets directly

Answer 2

It would be a dark night AND day indeed. Because of no light being reflected back, we will be hurt grandly by the uv rays of the sun, which would result in death, and death means no people, no people means that mo one would be there to see the dark day ie black day.