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You obviously don't watch enough Trek.
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Actually I've been watching through them in the last few months... So they are fresh in my mind... Just went through Nextgen, and I am now working my way through DS9...
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You obviously don't watch enough Trek. The TNG episode Parallels explains the concept that "anything that can happen does happen in alternate quantum realities." In that episode, Worf was being pushed from one alternate timeline to another to another. Also, this parallel universe concept is used with regard to the Mirror Universe which was introduced in the TOS episode Mirror, Mirror and was used in various episodes of DS9 and ENT.
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Actually in 'parallels', and other parallel universes, like the mirror universe, or Lazarus anti-matter universe, its explained that they universes exist outside the actions of 'prime universe'. Actions in one universe, has no influence on actions of another... and vice versa...
A choice in prime universe, doesn't spinoff another 'alternate universe'. The previous timeline simply doesn't exist, it ceases to exist.
That's why Spock, Guinan, and in Temporal Agents in DS9 and Voyager, go out of there way to fix history, investigate those who try to change time, and prevent history from being changed... All 'choices', do affect a single timeline the prime universe, and any 'travels' back in time, rewrites the future. Thus having to fix things through the Guardian by making sure Edith Keeler dies, 'Gabriel Bell' having to 'die' defending the hostages during the Bell Riots, or by sending Enterprise-C back to be destroyed in its own time...
In many of these cases, when time isn't fixed, the Federation ceases to exist, or is destroyed... Only a few characters from the regular timeline continue exist (but see that things are different), because they are protected in a timeless state, or chroniton particles etc...
Guinan is interesting because she exists in a way on multiple timestreams, and is capable of seeing when somethign has changed the prime timeline, and thus knowing it needs to be fixed... See Yesterday's Enterprise.
If 'quantam theory' was in affect, there would be no reason to have temporal police, because time could never be changed, and there would be no way to fix it. they would just be creating new 'parallel universes', splitting off from the others.
of course, let's not forget All Good Things, where the Anti-Time eruption, is growing bigger as it goes further back in time, and threatens destroying the creation fo the entire prime universe! Unless, Picard figured out how to stop it before it was created, and allowing 'present'! Correcting the timeline, and destroying the anti-time past, and anti-time future events.... Once fixed, the present went on, as if it events never happened!
Of course, in First Contact, there is the whole plot that they have to go back and stop the borg, or First Contact will never happen, and Earth and universe is assimilated... they briefly see for a moment Earth covered in borg cities... The idea is that they were worried about 'fixing the timeline they came from', rather than worrying about creating a new timeline in a new universe ('splitting' timeline)...
Enterprise even took that further, by showing that Archer being 'brought' to the future, wiped out the creation of the Federation, and allowed the others in the Temporal Cold War a chance to win...
But yes, my point is that time travelers know that they have 'restore' time... That's the problem with Star Trek 2009... Spock is out of character, because in the past shows, he knew that 'time had to be restored' (see all original series time travel episodes). Otherwise time as he understood ceased to exist... But in 2009 movie, he doesn't care to correct things, and decides to let the events develop on its own ('let them choose events for themselves.)
BTW, for that matter, the temporal agents, who spend there time shielded from time changes (so that they can go back and fix things), should have noticed something such as the Kelvin being destroyed, or Vulcan being destroyed, and going back to 'fix' things themselves! So ya, the movie creates certain plotholes with the rest of the series, by trying to shove itself into the regular series universe with its time travel story...
I suppose, if it turns out that Spock didn't 'go back in time', but rather went back into the past of a separate universe (like the Tholians did in In a Mirror, Darkley/Tholian's Web), then it wouldn't 'erase' the prime universe (ala mechanics of the regular trek series)... However, Nero's actions to 'destroy Vulcan' would be kind of pointless, since he's not destroying Spock's world, but some other universes's Vulcan... But then again Nero, is a rather ridiculous villain in general... Why did he spend 20 years sitting around, instead of going around causing trouble to the federation... Or why didn't he try to warn the Romulans of their world's doom from the 'galaxy destroying supernova' (as spock puts it)... The movie is so full of plotholes...
Also, the whole, "escaping' a black hole.... By jettising your warp core, and riding the explosion.... Hahahahhahahahahha..... Ya right....
In anycase, this essay pretty much clearly mentions and describes the descrepencies of classic trek time travel, and Star Trek XI's version of time travel (he still acknowledges the issue, though I suspect, he actually likes Star Trek XI)...
http://www.ex-astris-scientia.org/tr...vel-trekxi.htm