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Physics <<<<<Time Travel>>>>>, The Past, Present, and Future
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tgrrr
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 Jun 14 2009, 03:50 PM
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Interesting topic.
1. If time travel is possible, why hasn't any future human come by and visit us? Given the infinite amount of time available in "future", surely humans would have invented a time travel machine if it is at all a possible feat.
2. The paradox of what would happen if you travel to your past and changed something to yourself. What would happen to your current self then? I do not agree the concept of journeying to a parallel universe counts as time traveling.
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tgrrr
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Jun 14 2009, 04:05 PM
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QUOTE(Thinkingfox @ Jun 14 2009, 03:58 PM) I think they have. Think of events in history, like the accuracy of the alignment of the pyramids and why astronomers today still use Inca ruins to correct their computer calculation programmes. Probably this explains why there are sightings of UFO sometimes. They could be future humans instead of aliens. I think once time travelling is discovered, those in authority create some laws to govern time-travelling, to ensure that we do not go back and screw the past, which might lead to the extinction of humans. Your kidding right? I mean none of those explanations constitute hard evidence for the existence of time travelling. And I usually believe in simpler explanations rather than thinking of the many fantastic possibilities. Your arguments about time dilation merits some thoughts though. |
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tgrrr
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Jun 14 2009, 04:34 PM
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QUOTE(bubbliblu @ Jun 14 2009, 04:13 PM) 1. How do you know they hasn't came back? Probably they still look like us. Walk like us. Talk like us. And most likely time travelling in the future will be limited to certain groups of people only (like the military or scientists). It wouldn't be a public thing to do. Imagine the consequences if everyone can travel backwards. There will be chaos. Paradoxes everywhere when everyone alters history. 2. Well, the grandfather paradox. Like if you go back in time and kill your grandfather then you will cease to exist. Maybe that's what exactly will happen, you simply cease to exist. Maybe history can be altered... How do I know, no I don't know. I'm simply questioning the odds of it happening, when given infinite amount of time. And you're fantasizing la. Explain how a human being would simply "cease to exist". You think a bunch of molecules would just disappear without a trace like there's some kind of universe fabric with self-correction mechanism somewhere? I'm not disagreeing with your ideas, just that there has to be some more "reasonable" explanations for them. |
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tgrrr
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Jun 14 2009, 08:19 PM
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QUOTE(bgeh @ Jun 14 2009, 06:20 PM) No, the grandfather paradox would mean that the bunch of molecules will never end up turning into your present self. Sure they'll exist, but will you? Well TS just said I simply ceased to exists without elaborating further. Taking your point of view, say if I'm talking to you face to face right now while someone goes back in time and killed my previous self, the current universe that contains me would have to be unravelled and rebuild in a new fashion without me and everything that I have done or changed. The question is what physics law governs that to happen? You said "never". However I am "already" here so something has to make the change. I'm questioning what forces of nature governs or controls this self-correcting mechanism. For all the molecules that's going to be restructured, where are all those energies going to come from? The grandfather paradox scenario is I go back in time and killed or change something (killing my grandfather) that prevents my creation in the future so I couldn't have gone back in time in the first place thus creating a paradox. |
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tgrrr
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Jun 14 2009, 08:47 PM
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QUOTE(bgeh @ Jun 14 2009, 08:34 PM) There aren't any laws of physics I know of, regarding about what you're talking about. But giving it more thought, there isn't any need for 'energy' to change any action, because from the point in time you were killed, you 'ceased' to exist, and thus there doesn't need to be any unravelling of your actions in the time after that event, because you never participated in the thing in the first place. Of course this is all highly speculative, and has nothing to do with the physics of time at all. You mean I already rollback the time when I go back to my past? At which point the future no longer exists thus there's no need to make any changes in the future right? Ah yes, that's another scenario which I have thought of long time ago. But calling that time-travelling is stretching it. It's more like reversing back everything in time except me and my time machine, and probably already expended all the energy it required there and then. Haha I think this is getting too fantastic to think about. Maybe we should start defining what is or the different types of time-traveling. Keeping back to the original topic, I'm more interested on the time dilation theory. |
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