Hello, I have some questions about General Relativity that I cant seem to get an answer.
I read possible the universe can wrap back in on it self, so if you looked far enough in one direction you could see the back of your head. So this is understood as the space warping in 3 Dimensions.
1- But if the space is really empty & not like a trampoline surface (in 2D), than can you explain how the space doesn't have an edge or boundary if finite in spacial extent? This really bugs me unless I'm missing something obvious?
I just don't know how a 3D universe that is curved having no boundary & being finite can be with empty space?
thanks
