As usual, a very nicely written post! Thanks for contributing to SteemSTEM! I have a couple of comments :)

The Universe is still infinite and may well contain an infinite number of stars

Actually, there is no way to prove this. In standard cosmology, we consider what we call the observable universe that has a finite size. There is no way to know what lies beyond this. It could be something or nothing.

Most of the bright nebulae in the northern half of the sky are still labelled by Messier numbers. For example, the Andromeda Galaxy is Messier 31, or M31 for short.

Or the famous M87 and its famous black hole :)