05-27-2009, 09:14 PM | #1 |
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Why Time Travel (to the past at least) will never happen.
I was thinking about it the other day, and I realized time travelling to the past will never happen. Why? Well, the answer is very simple. But the answer is a question: If time travelling to the past was to ever be possible, wouldn't we have seen the results already? Surely, someone would have come back to (around) this time period.
But no evidence of anyone doing so has been seen. So at this point, you realize time travel to the past is never going to happen, unless: A. The time traveler didn't ever make himself known and just appeared to be a normal person. B. Time travelling to the past actually opens up a new time line, a la future Trunks in DBZ. I think the closest to that we'll ever get is recreating a physical environment from a memory, like in Assassin's Creed. Discuss (in before someone mentions John Titor). |
05-27-2009, 09:21 PM | #2 |
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Maybe they're just really good at not getting caught.
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05-27-2009, 09:27 PM | #3 |
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People to the past, then other people go back to just before they arrived and drag them back to the future before they can change anything.
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05-27-2009, 09:39 PM | #4 |
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05-27-2009, 09:46 PM | #5 |
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There was a fossilized shoeprint found in a canyon alongside dino fossils.
Maybe there are laws? Like, to keep time from changing? |
05-27-2009, 09:52 PM | #6 |
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The energy you'd have to use to punch a hole in the fabric of the ttime-space continuum would be that of a star. IF it could ever be done, it'd have to be a long time away.
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05-27-2009, 09:55 PM | #7 |
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05-27-2009, 10:00 PM | #8 |
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Cavemen were clever enough to invent the wheel and create fire, i'm sure they'd become clever enough to put something on their feet to stop rocks peircing and injuring them.
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05-27-2009, 10:48 PM | #10 |
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Superior Christmas Banner is Superior. Also still looking for ref with brain, although not just now due to Tyranidos running in fear. |
05-27-2009, 11:08 PM | #11 |
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The new timeline theory shouldn't be discounted. Multiple timelines would explain a lot of the weirdness shown by quantum mechanics.
There are also models of time machines that can't take you to any time before the time machine was created. |
05-27-2009, 11:47 PM | #12 |
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Holy shit it's HH where did you come from.
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05-28-2009, 12:56 AM | #13 |
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If I went back in time to change the past, that means in the future the event will not have had happened and as such, I would not have gone back in time to change said past, and thus a paradox is created.
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05-28-2009, 04:13 AM | #14 | |
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There was one episode of Lilo & Stitch where the protagonists use a time machine that already comes with its paradox elimination switch, allowing them to repeatedly go through a scenario without paradox-incurred consequences. Considering that paradoxes ultimately feature in time-travel discussion, assuming the technology becomes possible it'll be a huge factor in the design.
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05-28-2009, 09:13 AM | #16 |
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You travel fastest through time when you travel slowest through space, and vice versa.
The world around you (relative to you) travels fastest through time when you travel fastest through space, and vice versa. I imagine that this would be the key, but the problem is in the math: in order to go backwards through time, you'd need to go backwards through space. But conventionally "going backwards through space" is simply "going forwards through space but in the opposite direction," and time still flows forward whether you're backtracking your own path or not. In order to truly, truly go "backwards through space," it would require (a) movement we've yet to conceptualize but more importantly (b) a way to get around the math. Because, as mention, you personally travel fastest through time when you travel slowest through space, and because of that, it would create a paradox if traveling through space at speed = 0 resulted in both your traveling fastest through forward-time and fastest through backwards-time. Similarly, it doesn't hold up if we argue that 0 through positive infinity are the forwards-time numbers and negative infinity through -0.0000000000000000000[...]1 are the backwards-time numbers. Why should backwards not get to share in zero? More importantly, why should forwards have access to zero when backwards does not? You'd think 0 would either be shared or would be inaccessible to both parties.
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05-28-2009, 12:30 PM | #17 |
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I have heard of the multiple world theory which states that basically an alternate universe is created for every possible quantum decision you can make. So, if you did go back in time to kill your grandfather, it wouldn't affect you, because the outcome happens in another universe, not the one you live in.
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05-28-2009, 12:35 PM | #18 |
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Leibniz would say that if you went back in time it was always part of your essential self that you would have gone back in time, and we wouldn't notice a change, because it simply always had been.
But then again, he said that even though everything that you are and will do is already a part of you and is unchangable that we still have free will. So disregard. |
05-28-2009, 01:08 PM | #19 |
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05-29-2009, 02:06 AM | #20 |
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05-29-2009, 07:39 AM | #22 | |
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Well said.
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05-29-2009, 08:20 AM | #23 | |
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Quote:
If you've seen Back to the Future before, then you should understand what this means. If not, click the spoiler below. Click it anyway if you want to see what I wrote, but keep in mind that it's written for someone who's never seen the film and yet spoils the film all the same. Spoiler: show
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05-29-2009, 10:22 AM | #24 |
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Or in a theory from a better series, you will sleep with your grandmother and become your own grandfather. If it doesn't destroy spacetime, who are we to judge?
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05-29-2009, 10:34 AM | #25 | ||||
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