Where does the extra space come from as the universe expands? and if it’s just stretching, does that mean it somehow is getting thinned out?

Question

Where does the extra space come from as the universe expands? and if it’s just stretching, does that mean it somehow is getting thinned out?

In: 47

Answer 1

We don’t actually know for certain. It’s speculated that new “Planck Volumes” of space (the speculated smallest possible chunks of space) randomly pop into existence everywhere.