Eli5 if the universe is everything but it is constantly expanding, what is it expanding into?
In: 22
Question: can’t we say only the matter/dark matter is expanding? So that the “nothing” that’s between the stars is the same nothing as “outside” the universe just without the radiation and CMB… As I am not aware of there being a hard border of the universe. The big bang created the matter but did it also create the free space it occupies? Of not isn’t it to where it is expanding?
Latest Answers