[ShadowAce]

And the outside edge of the universe isn't expanding, all of space is.

What is the difference between "the universe" and "all of space?"

[Right_Wing_Madman]

What is the difference between "the universe" and "all of space?"

As the universe expands, gravity holds the galaxies and galaxy clusters together, but all the space between the galaxy clusters is expanding and galaxy clusters are becoming more far apart from each other.