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A timeline is a paradox filled science fiction plot device consisting of a series of chronological events, each a link from the past that leads up to the present. Timelines are sometimes portrayed as being vulnerable to alteration and are often threatened by the actions of time travelers.

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happen in real life. Has Star Trek ever explained this? At some point during the second half of the 20th century, there was a moment when our timeline and theirs diverged. …
asked Dec 22 '12 by Plutor