Time travel is an eternal yet fun debate. I for one believe that you could only ever travel back in time as an observer, and not truly be able to interfere or even be seen. As for travelling forwards, well, that's easy. You're affecting the future so just set the univrse's future course down a different route, you don't cross out or redraw the old route of history. So in conclusion, I believe forwards time travel is fully plausible, and that you can then go back to the moment you left (but no sooner). As for backwards time travel, I believe that is purely possible as an observation type thing.
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Are you a Pratchett fan?
If not go and read Thief of Time and Night Watch now!
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Yes. I adore Pratchett. I have read 24 of his books (not neccessarily in order, but I have read them in order by character), and I am currently midway through The Last Continent.
Not read Thief of Time but I've read Night Watch, it is superb even if it is slightly open to debate.
But any way, less time travel and book talk, MOAR SUPA POWAZ!