do you think time travelling is theoriically correct and practically achievable?
448383
Theoretically possible but practically unachievable. BAsically our mass increases considerably if we attempt to time travel. This is because we should travel at a speed greater than that of light. The difference of gravity between our head and toes at such speed would make that we would be torn apart. What we should first try to achieve is to transfer  ourselves to a 'body' of zero mass. We should first try to understand what is consciousness.-- If I were to 'phtocopy your brain pattern and reproduce it in a computer--would it still be u? --That sort of stuff. Once we are able to transcend this physical body, everything will be possible.
467849
I think that there is the theory that you could travel back in time, but it is really all Star Treckie.  I don't think there is any possibility of travelling back in time, no matter how fast you can go.
971027
No. Einstein's theory of relativity is commonly misinterpreted by non-scientists as "proof" that time travel is possible. However, Einstein's theory states that time & perception of time travels relative to your location and your surroundings.\nThus, if you are moving in an extremely fast velocity, atoms will move much slower (time will move forward slower).\n\nThis does NOT mean that you can travel back and forth in time. Time is NOT a linear dimension in which we can move up and down. Time in the non-scientific laymen's sense is really just a "perception" and invented by people.
1090
Causality prevents information from traveling "backward" in time, and is the most sacred tenant in physics.  Relativistic time-dialiation (above) is certainly interesting, but there is no time-travel theory (quantum or otherwise) that won't be met with anything but snide remarks by a real physicist.
823216
Yes!\n\nWell, in theory, at least.\n\nThe "Time Machine" would require the existence of a worm hole - something that scientists believe may exist in theory. Sadly, of course, we haven't actually found one yet, so this is all pie-in-the-sky, but if we *did* find a worm hole, then it's dead easy! (Sort of.)\n\nHere's how we do it.....\n\nFirst, find your worm hole.\n\nSecond, drag one end of the worm hole across space until it is next to the other end.\n\nThird, drag the end of the worm hole round and round the other end, at a speed as close to the speed of light as you can.\n\nNow, as we all know (don't we?) time travels more slowly for a moving clock. (Actually, this has been proved to be true, but that's something for another question - ask and I'll tell you how they proved it.) So, since time is travelling more slowly for the end of the worm hole that you're dragging around it will slip into the past relative to the end that isn't moving.\n\nLastly, simply jump in the end that you've been dragging around and you'll appear out the other end in the future. Then do it again and appear even further in the future. Repeat until you are as far into the future as you want to be.\n\nOnce you've got bored with the future (as if!) just go around the other way and you'll go back in time until you arrive back at the time you started.\n\nYou can't use it to go back into the past though, because you'll simply return to a time before you made your time machine i.e. before you dragged the other end across space.\n\nSee? It's easy! LOL
355289
it is believed by many time travel is not only possible but that it has all ready begun. look up time traveler john teeter or it may be john titor .tell me what you believe the truth is that you see
319526
According to Einstein, time travel like that which you are speaking is impossible. It revels in the laws of circular contradiction. Allow me to explain: If you were to go back in time and kill your grandfather, your parents would cease to exist and therefore you would cease to exist. But if you never exist, you cannot go back in time to kill your grandfather and he would therefore CONTINUE to exist and eventually you would be born into his lineage. Though time travel is impossible according to Einstein, he firmly believed that time VIEWING was completely possible. As for why you ask these questions, Einstein has no answer. Though Descartes might as he coined the phrase "I think, therefore I am." So perhaps you just "are", and that is why you ask these questions.
965397
Travelling back in time is not allowed by einstein's theory of relativity...however if you can instantly teleport youself to some faraway star,say a 101 light years away, you might be able to catch einstein receiving his nobel prize!! as stated earlier, there is no master grandfather clock that is regularly ticking away the seconds..rather that rate is adjustable...but one may zip into the future..consider an example where you are on a space-ship at a speed of 0.99990 c that is going away from the earth and coming back..in your time frame say,it takes about twenty years..using lorentz transformations, the time for your to and fro motion is close to 450 years!!
459750
The concept of a time machine could exist, but it would take an almost infinite amount of energy.  The only way it could work is exactly the way you are asking,  You can only move forward in time, just at different rates.  So if you want to see the future then time would need to slow down for you and the world would have to speed up.  After a while you could return to earth and it would be the future.  \nFrom what is presently known about physics you can only move forward in time only at different rates from an observers point of view.  Believe me if we could travel back in time someone would have already screwed it up something big by now.\n\nThis is a one way trip, good luck
284330
Time travel is possible. It has been proven with the use of atomic clocks placed on the earth and on board spacecraft which show a difference in time because of the difference of speed between the two parties. The faster you move in space, the move time that passes on earth.
386834
Well in all simplicity, if that were fact then yes it would be conclusive proof.  But can you state that we have never encountered a time traveler with any margin of accuracy?  I think not.  If technology ever reached the point of time travel, there is good reason to believe that philosophy and laws of that time period would dictate how our future friends would carefully act in their past (our present).  The same laws (along with technology) would also, most likely, prevent folks from misusing time-travel technology.\nAlso, I don't think we can accurately predict what sort of effects it would have on non-time travelers.  (I mean, you and me, the people who don't "go anywhere" in time)  Who knows weather we time-bound folk would have any way of perceiving the effects a time-traveler would have on the time line?
1105020
Possibly although Stephen Hawking once said that if time travel existed, we would see plenty of tourists from the future already and we would have historic accounts of them. There are plenty of theories of how it could work but no definitive solution has been developed.
720083
well its theoretically feasible to go forward in time but not backwards, but with today's technology its not very doable.
84170
the answer is - it depends - on a lot of things\n\nI hate to answer a question with a question but here goes ...\n\n- do you mean in theory or in practice ??? (in [einstein's relativity] theory it is possible to travel into the future - all you need to do is to go out into space for a while - the time here on earth will continue to progress at a normal pace while time for you will progress more slowly - when you come back you'll have essentially traveled into the future - not quite a time 'machine' but same effect
178315
You first have to decide what you mean exactly by 'time travel'. In one sense *everyone* is travelling into the future at the rate of 60 seconds every minute. No big deal. If you go  on a journey at a speed close enough to the speed of light, and return to the earth, you will have aged less than those on the earth by an amount that depends on how fast you were going. So, it is theoretically possible to spend 10 subjective years and come back 30 years in the future. We know this is possible from special relativity and we see effects along this line everyday in particle accelerators. The only problem is getting to high enough speeds. So if you regard this as time travel, there is very concrete proof that such is possible.\n\nBut the real question about time travel is whether you can *return* to your original time. Technically, that involves travelling in a 'closed, timelike curve'. While there are theoretical possibilities for such curves, nothing concrete along these lines has *ever* been seen. Furthermore, some theorists think that such curves are flat out impossible. So if this is what you require for time travel, then there is no hard evidence that it is possible.
12025
no, because time is only a mesurement that we humans have come up with.  if anything, you can't travel through time because there are an infinite number of universes constantly being created.
39192
Time travel is to travel to any point in the past or future. Ideas of time travel have existed for centuries, but when Albert Einstein released his theory of special relativity, he laid the foundation for the theoretical possibility of time travel. As we all know, no one has successfully demonstrated time travel, but no one has been able to rule it out either. It turns out that, in some sense, we are all time travelers. As you sit at your desk, doing nothing more than clicking your mouse, time is traveling around you. The future is constantly being transformed into the past with the present only lasting for a fleeting moment. Everything that you are doing right now is quickly moving into the past, which means we continue to move through time. To learn about the concept of time and the different theories surrounding the viability of time travel, you can visit this site: http://www.howstuffworks.com/time-travel.htm