yes, that's what i meant (i've just looked at my quote and realised it contrasts with my statement, very embarrassing). i personally dont beleive this theory myself, or have really even considered it, but travelling backwards in time using speed as the main element may make it possible for a 'time traveller' to come to our time, now, thus no time travel 'barriers' linked to the date that the machine was created (going by the crude theory of a ship that can withstand speeds that send the vessel
back through time, and dont obliterate organic matter contained inside).
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Or, set the timeline onto a new track in the quantum multiverse.
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call me ignorant but i personally found this a potential possibility. seems to make basic sense.
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Suppose someone did go back in time to murder their granny when she was a little girl. On this multiverse picture, they have slid back to a bifurcation point in history. After killing granny, they move forward in time, but up a different branch of the multiverse. In this branch of reality, they were never born; but there is no paradox, because in he universe next door granny is alive and well, so the murderer is born, and goes back in time to commit the foul deed
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this does not contradict my previous post, because if you move onto the neccessary branch of the multiverse after attempting to change 'history', it flows, therfore you never changed anything, because your now living in the 'new' present. but what makes me wonder is, would the new multiverse branch decided by the time traveller's objective begin the instant they arrived back in time, once the objective was completed/in the process of, or before they even reached their past destination? (did they even travel back in time?).