The universe wasn't expanding?
Not only the night sky,would it brighten up the day sky? To what degree would it have affected life on earth?
Olbers' paradox offers a good simple argument. Basically, if the universe is uniform and infinite (spatially and temporally) then the night sky would be blindingly bright (at the same level constantly). This refuted the Newtonian ideal of an infinite, static universe uniformly dense with stars.
This is actually what would happen if the universe wasn't expanding: if it is finite spatially then the brightness of the sky probably would vary depending on the sun's presence or absence. Otherwise if it is infinite spatially (and temporally) then probably the sky would be infinitely bright lol. I'm unsure about these claims so correct me if I'm wrong.
This is interesting. Thanks for the mention of the theory. I'm sure I've come across it before, but I appear to have forgotten it.
It's basically a physical version of Fermi's Paradox, come to think of it.