LightningStorm said:
Actually you can. IF we are working on the idea that there are an infinite number of alternate realities. Then there must be an INFINITE number of possibilities for the outcomes in each....
Being infinite means every single possible configuration of all of the matter and energy in each universe must be configured in every way possible.
That's a common fallacy. In fact, just because X number of possibilities are available, that doesn't mean that every single one of them
must occur. What you'd get would be a probability distribution, with the vast majority of alternatives tending toward the center and the more improbable outcomes being increasingly, even vanishingly, unlikely.
Also, there wouldn't be an infinite number of possibilities. Even if every single collapse of a quantum particle state in the history of the universe had resulted in the creation of a divergent timeline, the universe has only existed for a finite amount of time, meaning there must be a finite number of divergences. Keep in mind, also, that human beings have only existed for less than 0.0003 percent of the history of the universe, so the number of timelines that would include humanity at all would be vastly smaller. And the timelines that include civilization and an Industrial Revolution would be fewer still, and so on. Sure, there might be eleventy gajillion timelines out there, but most of them would have no Sol, no Earth, no mammals, let alone human beings or warp drive or people named Kirk.
An infinite number of possibilities does
not equal a certainty that every imaginable permutation will happen, because that's just not how probability works. Things only happen as a result of past causes. Only the timelines that have those causes will have a chance of producing a given outcome; all the rest will simply not be relevant to the calculation because they have zero chance of producing the result. And eleventy gajillion times zero is still zero.
The question is however, given the infinite nature of the multiverse, does there exist other universes that are perfectly identical to each other in every way? Since any random configuration of the matter/energy of that universe could at any time be the same as another.
In fact, this is fairly close to what would most likely result. Again, the majority of timelines would cluster around the center of the bell curve, with the most probable events happening in the largest number. There would be many that were largely indistinguishable except for minimal variations, like in TNG's "Parallels."
The problem with the idea of the Mirror Universe is that it posits a timeline that's exactly like ours in the majority of respects -- same general cultural history, same language and technology, same individuals serving in the same posts on ships of the same design and wearing almost the same clothes -- and yet radically opposite in many other respects. Those just don't go together. If the timelines were far enough removed for one to have a peaceful, inclusive Federation and the other to have a brutal, sadistic Empire, then a hell of a lot more would've gone differently as well. Just say, for instance, that Skon of Vulcan becomes ambassador to Earth in one timeline and a prisoner of the Terrans in the other. Even if he ends up with the same wife -- likely given that Vulcans are bonded at age seven -- the exact circumstances under which he conceived a child with her would no doubt be different. If it occurred at a different time, the sperm and egg cells that combined to produce their child would be different, and the child would have different genes as a result. It wouldn't be Solkar, and thus Sarek would never be born, and thus Spock would never be born.
Now multiply that by everyone who's affected even slightly by the altered history. Even just being late for an elevator could mean that someone never meets the person they marry in the other timeline -- what are the odds of it consistently happening when people are being murdered, enslaved, and conscripted en masse? Even if the divergence had just begun at first contact, by 200 years later the population of Earth should be made up of completely different people. That's the fundamental absurdity -- being so close and so different at once.