That tends to make it sound like you think of the Universe as existing within some pre-defined "space", such that other Universes could also exist in that same "space" - so that they could come into physcial contact.
Originally Posted by kevin1981
(Similar to how many people (contrary to mainstream science) think of the Big Bang as occuring in some pre-existing space and spreading stuff out into that space.)
That's not how it is. The Universe more or less is space and vice-versa, the Universe isn't just some (expanding) area of matter within an endless otherwise empty space.
So without branes or some other multidimensional kind of view of multiverses, how would two Universes come into contact? How do you define "close together"?
Get up, a get-get, get down.