The Void

"The Void" refers to pockets within the universe devoid of anything, including nothingness itself. Due to this lack of anything material or otherwise it is near impossible for outside matter to enter void spaces without the assistance of external forces. In most cases outside material entering void spaces will not affect them in any meaningful way, and they will remain as void spaces with alien material in them. The only way to collapse a void space is to essentially squash it on all sides until the space is forced closed.

All the space outside of the universe is also a void space, and as such it is infinite in size, despite it lacking anything physical or otherwise to give it "space".

Void spaces were not present within the original universe due to the nature of its creation through the big bang. The big bang spread the universe uniformly and did not leave empty pockets where matter did not exist. Due to the current universe being created directly by Wazyback it has imperfections in it that mostly present as these void spaces.