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Post by Saint on Mar 31, 2024 13:18:43 GMT
Stephen Hawking once claimed that time travel was impossible.
He said there was proof of this:
If time travel is possible, he said, where are all the people from the future? Their absence is proof of its impossibility.
I understand that he later changed his mind, coming to believe that time travel might be possible.
I don't know why he changed his mind, but it might be amusing to consider some of the flaws in his original proposition.
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Post by Deleted on Apr 3, 2024 0:06:58 GMT
Time travel only makes sense in a universe of limitless possible realities.
After all if someone came back in time and changed something it would alter the future so that the future the time traveller came from no longer exists. Only multiple realities can resolve this paradox so that the time traveller can return to his original future yet the changed future also exists as an alternate reality.
If we deny the possibility of multiple realities, then we must deny the possibility of future time travellers being able to visit us in their pasts. Otherwise we would have to wrap our heads around the possibility of their visits here changing their futures which in turn prevents them from visiting us so their futures are not changed after all so they can still visit us, ad infinitum.
Logically this either must mean that alternate realities are possible or time travel into the past is impossible.
It is difficult to wrap our heads around this, our brains as they are limited to logic in everyday situations as we have evolved to understand it. The actual reality of how everything works might well be beyond our ability to logically understand.
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Post by Saint on Apr 3, 2024 0:24:27 GMT
Time travel only makes sense in a universe of limitless possible realities. After all if someone came back in time and changed something it would alter the future so that the future the time traveller came from no longer exists. Only multiple realities can resolve this paradox so that the time traveller can return to his original future yet the changed future also exists as an alternate reality. If we deny the possibility of multiple realities, then we must deny the possibility of future time travellers being able to visit us in their pasts. Otherwise we would have to wrap our heads around the possibility of their visits here changing their futures which in turn prevents them from visiting us so their futures are not changed after all so they can still visit us, ad infinitum. Logically this either must mean that alternate realities are possible or time travel into the past is impossible. It is difficult to wrap our heads around this, our brains as they are limited to logic in everyday situations as we have evolved to understand it. The actual reality of how everything works might well be beyond our ability to logically understand. Yeah, I agree. We probably just don't have the conceptual apparatus to understand it. We probably haven't been given more than we need to survive. We don't need to understand that stuff, so we can't. |
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Post by RedRum on Apr 10, 2024 17:29:01 GMT
I feel like I have been here before.
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Post by Saint on Apr 11, 2024 7:59:42 GMT
I feel like I have been here before. That's interesting. You mean a sort of prolonged sense of deja vu? |
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