Time travel.. if its possible why havent we seen it.

Vonhelmet said:
My question is more based around your underlying assumption than anything else. We are already moving with the earth, yes? And when we fire a rocket into space, it continues to move in the same direction as the earth because of it's movement relative to the earth. If we time travel, do we retain our motion relative to the earth? If not, why not?

And sorry for digging at your spelling - that was cheap.
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we may not know until we do it and test it out. unless time travel occurs within a closed system and we can full model and observe the mechanics on this, then it is reasonable to assume it is going to occur under both external and internal forces some of which will be observed and some of which we are not able to observe.

how do we know that universe/galaxy shift is not effecting the results measured with a neutrino, where they are are not just moving relative to the closed system cern believe they are measuring.
 
Why not? I would more ask the question on how could it be possible to maintain relative motion? Logically you wouldn’t have relative motion, why would you? I have never seen any theory or idea on how relative motion could be maintained. I see time travel as working in one of two ways. Either there is some machine most likely with some sort of entanglement. You can jump to any point in that machines life span. This solves the problem of space and relative motion so you always end up going in the machine and out it again in another point it time but as a drawback you cannot jump though to a time to a stage when the machine wasn’t built.

The other option is you travel though time but stay in the same spot in the universe with all the problems I talked about. I see no why in which relative motion could be matched to Earth which this.
 
mrk1@1 said:
sorry i am not disagreeing that the theory proves the theory, it clearly does, but it does only this. there is no absolute proof of actual occurrence. the way you posted was like it is a done deal, a matter of fact and not just a mathematically modelled theory

and in verified experrimentally, you mean simulated with a theoretical model. otherwise you are indicating this has been physically tested and we have actually achieved the outcome.

seen your edit - fair enough then
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Yes I see your point. Physicists often throw around the word proof too liberally (it ****es of the mathematicians no end :p), but it is generally intended in the context of the model in question. Therefore, in this case if you assume the postulates of special relativity are true, then through a set of mathematical steps you can show FTL travel violates causality.

What I would say though is that the postulates have been experimentally verified in everything we have done to date (ignoring neutrinos :p), so it is hard to imagine a model where causality isn't violated with FTL travel.
 
stuman said:
as i can see it time travel is possible but not backwards. jumping forwards is do-able, and when (if) we do then we will jump in tech terms as we could send a ship out with the best scientists and researchers get her up to the speed of light send them off and see what they come back with.

but i'm not sure how this would work as we would need a propulsion system that can work up to the speed of light, and also a nav' system that can analyse at faster than the speed of light.

thinking about time travel sucks almost as much as films that use it. :(
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Not sure you have thought this throught too well :) How can they go into the future and see what they come back with if as you say they cannot then travel back?

Time Travel is a fallacy, it's quite simple really: you can't travel back in time because it has already happened and you can't travel forward because it hasn't happened yet! The speed of light thing is not time travelling at all, for all intents and purpose all what's happening is that time is slowed down locally for the person travelling at the speed of light but not for everyone else. It's nothing more than a posh suspended animation. And it's pointless as you can never get back.

Great stuff to fantasise about but I think common sense wins here.
 
Sorry I havent read all the thread but I am confused.

If I was 1 lightyear away from earth and could see the earth at that instant I would see the earth 1 year ago... True??

So if I travelled at twice the speed of light I could get 1 lightyear away and back to earth and it would still be the same time?

So therefore from that point if I could travel at four times the speed of light I would travel from earth, get 1 lightyear away 4 times faster than the speed of light, then travel back at the same speed I would be 6 months in the past when I got back. ???

Am I wrong...
 
Dan Dan said:
Sorry I havent read all the thread but I am confused.

If I was 1 lightyear away from earth and could see the earth at that instant I would see the earth 1 year ago... True??

So if I travelled at twice the speed of light I could get 1 lightyear away and back to earth and it would still be the same time?

So therefore from that point if I could travel at four times the speed of light I would travel from earth, get 1 lightyear away 4 times faster than the speed of light, then travel back at the same speed I would be 6 months in the past when I got back. ???

Am I wrong...
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Pretty much all science to date suggests that nothing can travel faster than light.
 
Time travel and wormholes... religious belief for some maths & science fiction buffs, in other words make believe. Its almost as if people can't accept the harsh reality of mankind. We are limited to one third of one planet, in one solar system and face a multi generation journey to travel to our nearest stars which may or may not have planets on which we can live. Now nothing wrong with fiction of this type, I just wish they would focus more on the harsh facts and leave the fiction to Star Track and it's ilk.
 
Yet I bet you can't live without your mobile communication device.

Or dvd/blu-ray player

Many things we use today was science fiction yesterday
 
Orcish-Horde said:
Time travel and wormholes... religious belief for some maths & science fiction buffs, in other words make believe. Its almost as if people can't accept the harsh reality of mankind. We are limited to one third of one planet, in one solar system and face a multi generation journey to travel to our nearest stars which may or may not have planets on which we can live. Now nothing wrong with fiction of this type, I just wish they would focus more on the harsh facts and leave the fiction to Star Track and it's ilk.
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wasn't so long ago people will have been saying that about flight...
 
mrk said:
Not so fast!
Just been reading thus on The Guardian:
http://gu.com/p/32643
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These were my thoughts too initially, but then surely this would have been accounted for thoroughly before releasing such a discovery to the scientific community? There are an awful lot of uncertainties, but I think they would have made sure to check, double check, and triple check before sending it out to everyone. I still hope that there is a significant discovery, but I am also very skeptical until it can be verified elsewhere.
 
Dan Dan said:
Sorry I havent read all the thread but I am confused.

If I was 1 lightyear away from earth and could see the earth at that instant I would see the earth 1 year ago... True??

So if I travelled at twice the speed of light I could get 1 lightyear away and back to earth and it would still be the same time?

So therefore from that point if I could travel at four times the speed of light I would travel from earth, get 1 lightyear away 4 times faster than the speed of light, then travel back at the same speed I would be 6 months in the past when I got back. ???

Am I wrong...
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Yes sort off you are wrong at least from the point of view I think you have. Depending on how FTL works and ignoring time dilation as that complicates matters. Let’s say the Year is 2010. If you travel one light year at a speed of 1 lightyear you are now be in 2011 one year later but you see Earth as though it was 2010 as you are looking at 1 year old light. If you now travel back to Earth at 4times the speed of light it takes ¼ of a year to travel back. So you would arrive back at earth ¼ of a year into 2011 or 1 year and 1/4 from when you first left Earth. Increasing speed cuts down travel time.

Likewise if you travel away from Earth at x4 the speed of light again ignoring time dilation. After ¼ of a year you will be 1 lightyear away and see the Earth as though it was 1 year old. But the time passed would only be ¼ of a year. If you then travel back to Earth in total the round trip would be half a year. But the point at when you stoped you looked at 1year old light.


EDIT:
“So if I travelled at twice the speed of light I could get 1 lightyear away and back to earth and it would still be the same time?”
Earth would have aged 1 year by the time you got back.
 
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If you travel at near light speed for ten yrs 5 there 5 back then earth would be 1000 yrs older but you would only be 10 yrs older.

On earth you would be a time traveller
 
mattyg said:
Time travel into the Future IS possible.

cosmonaut sergei krikalev has travelled 1/48 second into the future.
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No thats a myth he is in fact 1/48 of a second younger than he would have been if he stayed on the earth, due to time dilation. If he had travelled 1/48 of a second into the future ot to put it another way from his point of view we would all be 1/48 of a second older then he would have expected us to be. Nobody has travelled through time it just appears that way.
 
whilst the theory may work, we can rule it out practically using basic common sense.

If time travel was possible, it would only allow us to travel backwards in time. We can't travel to a time that hasn't occured yet, that's simple, and, if we could, wouldn't people from the future already have come back to let us know, or perhaps stop some of the atrocious world events we've seen in recent times?

In order for time travel to work, it cant be based on lightspeed, it has to be based on speed. Otherwise you might travel away 5 years at the speed of light and return and only be ten years older but you won't have seen the past or the future, as you won't be able to return, you'll be stuck in the present.
 
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dazzerd said:
No thats a myth he is in fact 1/48 of a second younger than he would have been if he stayed on the earth, due to time dilation. If he had travelled 1/48 of a second into the future ot to put it another way from his point of view we would all be 1/48 of a second older then he would have expected us to be. Nobody has travelled through time it just appears that way.
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We need to let these guys know
http://www.technicianonline.com/mobile/features/time-travel-expert-gives-presentation-1.2541764
 
Probably been said, but what's to say that it hasn't been created in the future and the reason we do not see people is because time travel into the past is regulated and against certain laws?
 
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