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Originally Posted by Thunderball
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Same reason Spock and the original universe didn't cease to exist when Nero entered the black hole singularity thing before he did. They didn't go to their past, they went to another universe that was identical to theirs until Nero showed up. The universes are apparently the same before the Kelvin attack, which changes everything, scars young Jim Kirk, delays the Enterprise's construction by several years and makes the technology way different.
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My interpretation was that they went back to an earlier time in their own universe, but in doing so, essentially caused it to be split into two realities. Perhaps that interpretation is coloured by watching Fringe and seeing a lot of similarities there in terms of alternate realities (although I hope that Star Trek, now that it's in a branched reality, will progress forward and not involve further jumping back and forth with the alternate reality).