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Is time travel possible?

??

Depends on your definition of time travel. You could move ahead in time (at least it would appear that way) if you were traveling near the speed of light in normal space. Moving backwards in time would be the real trick though. I'm not sure if there are any working theories on how to do that (although there is a theoretical negative velocity). If I'm not mistaken, they are in the process of launching a satallite to futher test the confines of general relativity...I'll have to try to find the link.

Gravity Probe B

http://www.reuters.com/newsArticle....storyID=4857217

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Originally posted by occrider Gravity Probe B http://www.reuters.com/newsArticle....storyID=4857217

There she blows. "Gravity Probe B" sounds like some cheesy 70's porno.

In a word, of course! The way you have posed the question, I just travelled from 10:53 to 10:55 as I wrote this message!

Honestly though, I have never been able to fully believe that the speed of light is an asymptotic velocity. Given that the speed itself is an absolute number, 3x10^8 m/sec is very fast, but if there is no scientific reason why something can't travel at 2.999999x10^8, then why can't something go just a little faster with a little more incremental energy. I guess I have a hard time believing it because in my mind an infinite amount of input should lead to an infitite output, and given that 3X10^8 is a finite number, it would seem to me that a finite amount of energy would be required to reach that speed. Of course relativity complicates things immensely! Whether time travel is indeed possible or not, it is interesting to think about the ramifications of crossing over the speed of light threshold. I have no clue what would happen or what the experience would be like. I remember an old physics professor telling me that even if we could go faster than the speed of light, it would be impossible to reverse course and cross the threshold again back to the other side once said velocity is reached.

Anyway, I have no idea about time travel. It's a wacky concept that seems far fetched but not impossible.

black holes have no time or space. because in the inside, it is not moving, and it is packed so dense, that space doesnt exist within.

and to have time, u must be moving. if the earth were not traveling through the universe. just stayed stationary, didnt spin or anything. then earth would not have time.

Of course you can!

They've already done it many times. I've been watching this documentary on television and they have this very nice starship which not only goes 9x the speed of light or something ridicilous like that, but on many episodes they have gone back in time.

The fact that we can watch a documentary set in 2300 should bear testament to time travel alone.

According to this documentary, which only chronicles one ship as it explores the confines of space, the future looks very opmitimistic! We all get to live in a federation of planets, and there are these cool guys that have pointy ears and only think in logic - sort of like Occrider - plus everyone wears these kick ass uniforms.

No...
now it's not possible...
maybe one day i'll found the answer...

Re: Is time travel possible?

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Originally posted by Dopey ??

Yes, Christopher Lloyd proved it

John Titor as well.

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Originally posted by occrider John Titor as well.

Don't forget Clark Kent...er Superman. He was much more proactive.

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Originally posted by Yoepus Of course you can! They've already done it many times. I've been watching this documentary on television and they have this very nice starship which not only goes 9x the speed of light or something ridicilous like that, but on many episodes they have gone back in time. The fact that we can watch a documentary set in 2300 should bear testament to time travel alone. According to this documentary, which only chronicles one ship as it explores the confines of space, the future looks very opmitimistic! We all get to live in a federation of planets, and there are these cool guys that have pointy ears and only think in logic - sort of like Occrider - plus everyone wears these kick ass uniforms.

Wow I saw that too! Apparently the human race is destined to overcome all scientific barriers except for the nagging nuisance of static cling-on.

Oh by the way, I'm from the future.

I saw this documentary once about this Proffessor who is actually building a 'time machine' (I actually emailed him to explain to him why, if his beliefs were correct, his time machine might destroy the universe. He didn't reply)

In this machine, there are some lasers that are arranged in some sort of spiral formation. No fucking idea how it was supposed to work but they were gonna send a particle into the machine which would bounce of the laser beams and reach the speed of light, coming out of the machine before he put it in!

Basically, as soon as he switches this machine on he should recieve the particles he already put in in the future (figures!) So he had to believe in the mutiple universe theory otherwise when he saw these particles and decided not to put a particle in the machine then how could they get there?

My problem was that if this works as planned and there is a multipe universe (an infinate number of universes) then when he switched the machine on, in theory, there could be an infinate number of particles appearing in the same spot at the same time (which if it were infinate, would mean as many particles as there are in the universe, ie alot, appearing in one spot at the same time!) if there are an infinate alternate futures where this guy puts a particle in the machine. Not sure what would happen if the same amount of particles that existed in the entire universe appeared in one spot at the same time, but I didn't like it and emailed him my concerns.

Crazy bastard never replied!!!

In answer to the original question: Nothing in the current theories of physics prevents it. Read David Deutsch's "Fabric of Reality" for some really mind-blowing explanations as to why the "paradoxes" related to time travel (e.g. the grandfather paradox) really is no hindrance either.

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Originally posted by Shakka In a word, of course! The way you have posed the question, I just travelled from 10:53 to 10:55 as I wrote this message! Honestly though, I have never been able to fully believe that the speed of light is an asymptotic velocity. Given that the speed itself is an absolute number, 3x10^8 m/sec is very fast, but if there is no scientific reason why something can't travel at 2.999999x10^8, then why can't something go just a little faster with a little more incremental energy. I guess I have a hard time believing it because in my mind an infinite amount of input should lead to an infitite output, and given that 3X10^8 is a finite number, it would seem to me that a finite amount of energy would be required to reach that speed. Of course relativity complicates things immensely! Whether time travel is indeed possible or not, it is interesting to think about the ramifications of crossing over the speed of light threshold. I have no clue what would happen or what the experience would be like. I remember an old physics professor telling me that even if we could go faster than the speed of light, it would be impossible to reverse course and cross the threshold again back to the other side once said velocity is reached.

The problem of the "add more energy to gain that last bit of speed" argument, is that E=mc^2-thingy. When you add more energy to the high speed object that you want to accellerate even more, there's no reason why the added energy should translate into greater speed. It can just as easily be transfered into extra mass. Therefore, you can push your object as long as you desire, it just gains in weight rather than accellerate.

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Originally posted by George Smiley I saw this documentary once about this Proffessor who is actually building a 'time machine' (I actually emailed him to explain to him why, if his beliefs were correct, his time machine might destroy the universe. He didn't reply) In this machine, there are some lasers that are arranged in some sort of spiral formation. No fucking idea how it was supposed to work but they were gonna send a particle into the machine which would bounce of the laser beams and reach the speed of light, coming out of the machine before he put it in! Basically, as soon as he switches this machine on he should recieve the particles he already put in in the future (figures!) So he had to believe in the mutiple universe theory otherwise when he saw these particles and decided not to put a particle in the machine then how could they get there? My problem was that if this works as planned and there is a multipe universe (an infinate number of universes) then when he switched the machine on, in theory, there could be an infinate number of particles appearing in the same spot at the same time (which if it were infinate, would mean as many particles as there are in the universe, ie alot, appearing in one spot at the same time!) if there are an infinate alternate futures where this guy puts a particle in the machine. Not sure what would happen if the same amount of particles that existed in the entire universe appeared in one spot at the same time, but I didn't like it and emailed him my concerns. Crazy bastard never replied!!!

This has already been done, I think at CERN? Well, somewhere at least, scientists have managed to use a similar technique to bounce a laser back in time so that it shone before it was turned on... but the thing is, it travelled back an extremely tiny tiny fraction of a second. So to the human brain, all it saw was a switch being thrown and a laser turning on. It took sophisticated computers to measure the difference. So that rules out the possibility of the paradox of turning it on, then not actually turning it on, or whatever.

you must be able to escape the confines of relativity to move forward through time. relative to to the observer.



i.e. another form of physics need to be applied.


...and they can only be applied in theory because you humans have not graduated to the next level of energy manipulation.

relativity owns you.

quote:

The problem of the "add more energy to gain that last bit of speed" argument, is that E=mc^2-thingy. When you add more energy to the high speed object that you want to accellerate even more, there's no reason why the added energy should translate into greater speed. It can just as easily be transfered into extra mass. Therefore, you can push your object as long as you desire, it just gains in weight rather than accellerate.

I think my physics professor was once telling me that even if the energy didnt trasfer into mass, that it would be impossible to reach the speed of light. You would always be off for just a little. Like you reach 0.99, go a bit faster and instead of doing 1.0 (speed of light) you would be doing 0.991 ad infinitum .



But even as im saying that now i still belive that some time in the (distant) future a man will stand up from a chair and say "Set course fot the Second star to the right and straight on 'til morning...Warp 9 engage"

quote:

Originally posted by trancaholic The problem of the "add more energy to gain that last bit of speed" argument, is that E=mc^2-thingy. When you add more energy to the high speed object that you want to accellerate even more, there's no reason why the added energy should translate into greater speed. It can just as easily be transfered into extra mass. Therefore, you can push your object as long as you desire, it just gains in weight rather than accellerate.

Thanks. Makes perfect sense, I just don't want to believe it!

I actually time travel into the future all the time! Everytime I fall asleep or read a book on the train time always speeds itself up!

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Originally posted by Q5echo you must be able to escape the confines of relativity to move forward through time. relative to to the observer. i.e. another form of physics need to be applied. ...and they can only be applied in theory because you humans have not graduated to the next level of energy manipulation. relativity owns you.

your avatar kills. its awesome

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Originally posted by occrider John Titor as well.

Dave Attell time travels as well.

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I started blacking out - or as I call it, time-travel. You wake up, you're playing that knife game with a half-Indian somewhere in North Dakota. You black out again, you wake up, you're in White Castle workin' there three years, still not assistant manager. Your buddies tell you to quit, but you can't 'cause you're bangin' the slow girl on the fryer. They say she's a little dim but those titties ain't dim"

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Originally posted by ::TranceVanDyk:: your avatar kills. its awesome

thanx.

quote:

Originally posted by trancaholic The problem of the "add more energy to gain that last bit of speed" argument, is that E=mc^2-thingy. When you add more energy to the high speed object that you want to accellerate even more, there's no reason why the added energy should translate into greater speed. It can just as easily be transfered into extra mass. Therefore, you can push your object as long as you desire, it just gains in weight rather than accellerate.

Heh, it's more like it seems that the object is gaining mass because more and more energy is needed for it to keep accelerating. The formula goes that E=(mc^2)/sqrt(1-(v^2/c^2). So I guess you could say that 1/sqrt(1-(v^2/c^2)) is some sort of imaginary mass modifier.

Now, about the future. Ever wonder how those communicators know to whom their owners want to speak? Say for example, when Picard (the ship captain, not the one who created the funnel shaped universe theory) tries to speak to Riker. He says "Picard to Riker". But have you noticed that Riker hears on his communicator that same "Picard to Riker" sentence? And nobody hears it except him. So somehow the communicator knows that Picard wants to speak to Riker even before he actually says that "Picard to Riker" sentence. That's been bugging me for years now...

quote:

Originally posted by ::TranceVanDyk:: your avatar kills. its awesome

I thought you were a fundamentalist Christian? Surely that's lust & sexual immorality?

Deary me, you'd better repent asap - or you're going to hell my friend!

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Originally posted by arctic I thought you were a fundamentalist Christian? Surely that's lust & sexual immorality?

OK, that av is indeed what I thought it was

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