If time-travel was developed and we went back in time and altered a historic event, would it change trhe future or simply create an alternate time-line?
If there can be only one time-line, then changing the past would mean that once the present is reached there would be no reason to go back in time to change anything, which would mean the present would resort to its original path, requiring time travel again to change it.
But if time travel creates an alternate time line (alternate universe?), a new present would be created, but the old one that they sought to change would still exist. And once they have change the event they wanted to change and go back to the "present", which present time would they return to? The changed one or the original?
Yes? No? Maybe?
If there can be only one time-line, then changing the past would mean that once the present is reached there would be no reason to go back in time to change anything, which would mean the present would resort to its original path, requiring time travel again to change it.
But if time travel creates an alternate time line (alternate universe?), a new present would be created, but the old one that they sought to change would still exist. And once they have change the event they wanted to change and go back to the "present", which present time would they return to? The changed one or the original?
Yes? No? Maybe?
via JREF Forum http://forums.randi.org/showthread.php?t=267769&goto=newpost
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