there is no emptiness, only anti matter and matter and a few other things. once thought the nucleus (spellling, i think, i hate that word) of an atom was empty, come to find out there are things revolving inside of them in a pattern.
I think that it is not for us to know, and once we discover what our minds are not able to comprehend, we will seal out fates.
I agree that the univese is infitely expanding, that has been proven with our current technology.
I agree that there is an infinite amount of dimension, actually there are many dimensions that have been theorized mathematically, but not proven physically. Dont ask me to name them, cuz that was a few years ago in chem.