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

I believe that it appears that space is expanding in 3 dimensions. When we consider other dimensions we don’t know what’s really happening. The only way I could understand additional dimensions is to imagine living in a 2d space. All you can see left right and forward. Someone living in a 2d plane can’t see the third dimension since they can only see left right and forward and back but not up or down.