system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is space black? Aren't the stars emitting light?

I don't understand the NASA explanation.
gpt
This is called Olber's Paradox.

In essence, if we posit that the universe is infinitely large and contains an infinite number of stars (and they are largely randomly distributed), then every line of sight an observer can see should eventually end at a star.
So if the universe is infinitely old, every point in the sky should be as bright as the surface of a star.

Since it clearly isn't - we have to discard one or more of our assumptions.
(They are the universe is infinitely large, contains an infinite number of stars and is infinitely old)

This is evidence for the big bang - we discard the idea that the universe is infinitely old, so although every line of sight does end in a star, the light from those stars has not had time to arrive yet. (As the speed of light is slow compared to the size of the universe).