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Fringe presents a wonderful concept of existence of a parallel universe. In one episode, Walter explains how the choices made by the people affect the lives in parallel universes. Of course, with time a lot of choices are made and they affect our lives.

Both the universes are shown with the same set of characters with a little difference in their lifestyle.

Now my question is, How come the same versions of people exist in both the universes, when every single choice made, affect the course of the future. If every choice affect the future, then why not some characters did not exist in either of the universe. I know the father of Astrid died in one of the universe, but my question is some of the characters must not have born in either of the universe.

I know from the tv-series point of view, it might not have been possible to introduce new characters but the concept could have been more realistic if that would have happened.

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There's not necessarily just 2 universes. Each choice can potentially start another one. –  Meat Trademark Mar 22 at 9:28
    
so, the other universe shown in the series, was the one in which only the choices made by the current generation were different..?? The choices of ancestors of both the universes were the same?? –  Tanuj Wadhwa Mar 22 at 9:30
    
Not all universes have to know about other universes. It would appear that these two are only slightly different, given all the choices made in the past. Our side didn't even know until Walter was able to prove it and cross over. Most universes will be similar, given that any choice can create another. Eating sausage with breakfast instead of bacon can cause another universe, but its differences are minor and mostly unnoticeable. In one universe a guy's tie is a different color while in another dinosaurs still walk the planet. –  Meat Trademark Mar 22 at 10:55
    
@MeatTrademark In Fringe, there are only two universes. –  user209 Mar 23 at 1:01
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scifi.stackexchange.com/questions/8335/… The show only concentrates on two because Walter crossed over from Here to There. There are many others, we (or they) just can't get to those yet. (I think.) –  Meat Trademark Mar 23 at 6:57
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Well it entirely depends on which theory of the "multiverse" is adopted. They are not all the same and/or implemented the same way. You might want to give the different theories a read to better understand how it is represented based on point of view:

The structure of the multiverse, the nature of each universe within it and the relationship between the various constituent universes, depend on the specific multiverse hypothesis considered. Multiple universes have been hypothesized in cosmology, physics, astronomy, religion, philosophy, transpersonal psychology and fiction, particularly in science fiction and fantasy. In these contexts, parallel universes are also called "alternative universes", "quantum universes", "interpenetrating dimensions", "parallel dimensions", "parallel worlds", "alternative realities", "alternative timelines", and "dimensional planes," among others. The term 'multiverse' was coined in 1895 by the American philosopher and psychologist William James in a different context.

The multiverse hypothesis is a source of disagreement within the physics community. Physicists disagree about whether the multiverse exists, and whether the multiverse is a proper subject of scientific inquiry. Supporters of one of the multiverse hypotheses include Stephen Hawking, Steven Weinberg, Brian Greene, and Max Tegmark. In contrast, critics such as David Gross, Paul Steinhardt, and Paul Davies have argued that the multiverse question is philosophical rather than scientific, or even that the multiverse hypothesis is harmful or pseudoscientific. [Source]

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