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getting back to where you started...mhm....sounds just like something that could be realistic. let me take this matter into perspective with reference to games ect.
think of that theory in the way, you get back to where you started. think of it as a ball. think of the ENTIREEEE universe in a ball. put that ball into the middle of a black box. what would you call the area around the ball. the universe cant float on nothing. The universe may be circular, and you get back wherever you started(considering that that theory is in fact true), then that space around the area of the universe, has to also be contained of matter in order to exist. but then we get to the other theory that nothing can exist when you reach 0k because molecules stop moving. so what in fact would be call that matter around the universe? we can't call it "nothing' because it actually still exists. see where im getting.
yea i know its not your theory but when i refer to "your theory", im referring to what you said. ahah sorry for the confusion. yea, but my point with them touching, i know theyre not physically touching, but in the theory kaku has, about the universe being spherical and linear, then theres no way of getting out of the universe. its like an internal gravitational force on the outer part of the universe, holding you back from leavin. if i were able to make diagrams i would, but i cant and it would be easier to explain.
Here is a video to try and explain some of this stuff to people. It is very good
ahhhhh my brain hurts