Why is the night sky dark?

An article in Popular Science about why the night sky is dark interviews Will Kinney, professor of physics, who said the further out into the universe you look, the farther back in time you see. “Cosmologists are really lucky. You can see the entire history of the universe laid out in a nice line,” he said, adding that if you look deep enough, you can see so far back in time that you get close to the Big Bang. “You just run out of stars. And you run out of stars, in the grand scheme of things, relatively quickly.”