system
Given the following post, respond as if you're commenting on Reddit:
human
Would the night sky have appeared much brighter in the time of the dinosaurs?

Given that the universe is expanding, and that apparent brightness of celestial bodies is governed by the inverse square law, would there have been a noticeable difference in the brightness of the night sky during, say, the early Jurassic Period?
gpt
The universe is expanding, but gravity keeps small-scale (relatively speaking!) structures like galaxies - and even groups of galaxies - together. The volume of space containing all the stars we can see is a vanishingly small part of our galaxy! So the number of stars visible doesn't really change as the Universe expands. It might fluctuate a bit as the solar system makes its long orbit around the galactic center.