I have been watching the television show "Fringe." It involves an alternate universe, similar to ours, but with some differences. This got me thinking about alternate universes and time. I came to the conclusion that, if there are alternate universes, they either have to be exactly the same, or very, very different. It is highly unlikely, maybe even impossible, for two universes to be similar but not exact.
Why? Because of time. Any difference, no matter how small, will start a new time line that will multiply the differences. The more time goes by, the more the differences spread and multiply. So, in order for an alternate universe to be similar to ours (but not exact), one of two possibilities would have to exist - both of which are extremely unlikely. The first possibility is that both universes are brand new. This is obviously not the case with our universe. The other possibility is that the two universes have been identical until very recently. In other words, we just happen to live at the single point in time when the very first difference between the universes appeared. As you can see, this is also very unlikely.
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