If we reverse time and take this universe in past, like x years ago, what are the chances...
[From: ] [author: ] [Date: 13-05-28] [Hit: ]
except that we cant reverse time right now, not even for a microsecond. If we could reverse it, chances are it will go the same way as it did last time. Please explain how you reverse it, and reverse the course of galaxies.......
The thing that generates differences on the macroscopic scale is chaos. Even quite simple things can exhibit chaotic behaviour. For instance, if you have a universe that is empty apart from three objects orbiting around one another their positions are unpredictable in the long term. Even though we know the exact rules that govern the way each object affects the motion of every other object there is a limit to how accurately we can predict their positions after a certain amount of time. It's called the three body problem.
So, for instance, if we re-ran the universe from 200 million years ago there is a chance that the asteroid that finished off the dinosaurs would miss the Earth, in which case humanity would not be here.
Actually, relativity tells us that there is no universal time frame and quantum theory tell us that there is no single universal reality, so I'm not even sure the phrase "the same universe" can have any meaning.
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The very very early universe was dominated by quantum mechanical processes, so at this stage its detailed progress was extremely random. Eventually it became dominated by macro physics, which is more or less repeatable at the macro scale.
So the future of the universe becomes more predictable as time moves on, and the same goes for localised parts of the universe.
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Anything is possible, except that we can't reverse time right now, not even for a microsecond. If we could reverse it, chances are it will go the same way as it did last time. Please explain how you reverse it, and reverse the course of galaxies. Energy needed is well beyond the entire energy of all the universe. If you don't believe me, try reversing a bullet fired from a .22 rifle at 10 feet away using just your hands .
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Greater than 0% and less than 100%.
It would not be exactly 0%, because it happened this way at least once, so the chance, given identical initial conditions has to be greater than zero.
It would not be exactly 100%, because of some complicated things having to with with quantum mechanics and uncertainty.
Sorry I cannot narrow it down any closer than that, someone with a better understanding of quantum mechanics might be able to give you a narrower range, but I doubt anyone could give you the exact probability. I would also imagine the probability would approach zero the further back you go.
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It may be, the thing is everything about a past is just theoretically. There is no 100% in any of theories. So the answer would be 50%. And I hope that by x you mean at least 100 000 years.
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