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Sep 18, 2016 at 5:41 comment added celtschk Well, maybe create a stable time loop by (a) preventing 9/11, and (b) brainwashing your younger self into believing that 9/11 actually happened.
Sep 18, 2016 at 0:32 comment added GreenAsJade The phrasing of this answer implies that the author thinks that all these reasons mean it is not possible (or that's the way I read it). That's not the case at all. For example, it's not that hard to conceive of a stable time loop where I leave myself all sorts of compelling clues about what I have to do in the future, and might make a very interesting story about the increasing anguish I face as I realise I have to do it. There's also a different interesting scenario/story that questions the cause of your mysterious arrival at a point in time with all these memories...
Sep 17, 2016 at 21:56 comment added Trish @Michael now... I did some more thinking and added a way out of the stringency of the causality chains: MWT.
Sep 17, 2016 at 21:55 history edited Trish CC BY-SA 3.0
added 319 characters in body
Sep 17, 2016 at 21:47 history edited Trish CC BY-SA 3.0
added 319 characters in body
Sep 17, 2016 at 21:46 comment added Michael Except those aren't the only possible ways that time can work. Your own example of Dr. Who is a good example, as consistency isn't even wanted or needed there: "You can't redo or fix anything you did yourself... except when you can."
Sep 17, 2016 at 21:37 comment added Trish @Michael Actually no, I did not say that he can't try, only that there are only 2 outcomes that can't make time paradoxes: either he fails to achieve it and thus maintains the reason to go back in time, or his timeline had the attacks fail in the first place and he has to make sure it does so again, to maintain causality. The main thing is: Time heals itself: if you try to change the timeline, it usually results in you not changing it in the first place. Understanding Time-Quantum-Mechanics is fundamental to writing time travel plots.
Sep 17, 2016 at 20:13 comment added Michael This answer is questioning premises of the question which were already assumed to be given.
Sep 17, 2016 at 15:06 comment added Trish my point is: Either he can't change the timeline due to it being his history that it happened already, he creates an instable time-loop, or his history is already that 9/11 never happened and he (or some other timetraveller) has to become the reason that will happen, no matter how hard he tries not to prevent it. Causality governs it all
Sep 17, 2016 at 14:39 comment added WGroleau While a nice commentary on time travel, it does not even approach answering the question as stated.
Sep 17, 2016 at 14:18 comment added LukeG -1 Not enough "wibbly wobbly timey wimey" in the Doctor Who part
Sep 17, 2016 at 11:10 history answered Trish CC BY-SA 3.0