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Career Officer
Join Date: Jun 2012
Posts: 2,916
# 12
10-08-2012, 04:33 AM
We already know that there are millions of parallel Star Trek universes. Going into the past and changing things merely creates another one. It will not affect the actual future (or present).

However, once you have entered a different universe, the only reliable way to get "home" is to set things straight again so they develop roughly in the way that your own universe did, so when you go "back" into the future, this new universe won't differ too much from the old.