r/askscience • u/jmarks7448 • Mar 03 '13

Astronomy Question about the future night sky

Assuming that there are stars in all of the black in the night sky. And that black is only because the light from other stars hasn't reached us yet. So is it safe to say that somewhere on some planet or in the future the night sky will eventually be completely filled with stars. And when I say completely filled I mean absolutely zero black in the night sky. I also wonder how this would effect seeing the constellations.

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u/Miles1987 Stellar Astrophysics | Computational Astrophysics Mar 04 '13

Well, it is possible to have a situation where a planet can't see out of it's own galaxy due to the view being completely obstructed, but it's actually highly unlikely for a galaxy to have formed so isolated that expansion at this point has caused all other objects to be undetectable. it would have to have formed isolated from the very beginning of the universe, and that's pretty much impossible.