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Jan7-12, 10:20 PM
DaveC426913's Avatar
P: 15,319
Quote Quote by mr. vodka View Post
Anyway, for our 3D spatial universe you have to inflate a "balloon" in 4D instead of 3D. You see that the "center of the balloon" isn't a part of our physical reality at all.

(To be exact, you'd probably need a 5D space, as time is an extra dimension, but that's besides the point in this discussion.)
In fact, not only do you not need a 5th dimension, you do not even need a 4th. The mathematics of a curved 3D space work out just fine without needing to invoke a 4th dimension in the equations.