Is a parallel universe a different dimension?

Could there be such a thing as a parallel dimension? Might we go there? One problem, according to theoretical physicist Brian Greene of Columbia University, is that the show mixes up other dimensions with multiverse theory. We have a universe with three dimensions and if you include space-time, four. read more

Parallel universes in science fiction. Here are some of the more prominent uses of parallel universes in science fiction. (This is by no means a complete list, but a sampling of some of the more-quoted examples.) Marvel Comics and DC Comics feature stories set in parallel universes that are part of the multiverse. read more

The main difference is that parallel universes co-exist whereas only one history or alternative history can exist at any one moment. Another difference is that moving to a parallel universe involves some inter-dimensional travel whereas alternative histories involve some type of time travel. read more

What's interesting about this theory is the other universes could have very different laws of physics than our own, since they are not linked. 3. Daughter universes. Or perhaps multiple universes can follow the theory of quantum mechanics (how subatomic particles behave), as part of the "daughter universe" theory. read more