is it possible to travel back in time and if yes how is it possible?
823985
yes I do it all the time............................where  do you people come from???????
59515
Time travel is actually 100% possible.  You're time travelling right now, the problem is that you cannot control how to time travel.  \n\nIf you had enough fuel on a spaceship that could go at 99% the speed of light, the time on the spaceship is slowed down dramatically, this is called time dilation, which means your biological clock also slows down, slowing your aging process.  If you come back to Earth by travelling 60000 light-years, you're only 40 years older then, but the Earth and everyone on it is 60000 years older.\n\nTime travelling to the past is currently not possible.
18327
If you would belive in the parallel universe theory\nthere is a possibility that the past exists in a \nanother parallel univerese.However if you would\nbelive in the space-time continum,the past would\nnot simply exist as would the future.But theoriticaly\ntime travel is possible is you consider slowing down\nthe rate of time advancing but this will not lead you to the past but it would take longer you to reach the future in your particluar reference of time\n,here relativity comes into picture and the solution is still not clear.
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
519456
There are some strange solutions to Einsteins field equations which some theorists claim to offer the possibilty to travel backwards in time but these are pure hypothesis.\n\nFor one of these possibilties you would need a huge amount of "strange matter" which we yet even don't know what it is exactly, other of these hyothesis would allow to travel back in time, but not past the invetion of the thime machine, since this time machine is the "exit" on the other side of the "time tunnel".\n\nOther scientists say it will never be possible, for varios reasons, one of the most mentioned is the problem with causality (althogh there are again theories that that would't be a problem) another very funny one is by Stephen Hawking: There never will be time machines, becaus if it would we would see tourists from the future all the time.\n\nSo, seriuosly, don't expect to see a working time machine during your lifetime.
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.
122265
String theory suggests that when you travel back in time you actually travel into another dimension so theoritically speaking, you would be bringing back yourself from another dimension. But, I don't think you could even get back to your own dimension.
1013338
glad u asked!! yes it is very much possible. how well, using a worm hole. what is a worm hole?? well, to explain that i think i will consume a lot of time so i suggest that u go to the link i shall give below. of course at the end of site it is written that any info that goes thro the "throat" shall be destroyed, but its much logical than any sci fi thing.\n\nand i would use time machine to go back to see how the dinosaurs were like, and to go to the future to see the discoveries that the future ppl may have made.\n\nactually i'd like to share with u that it may be possible that we are some form of energy in the past or future, coz if we alter the past or bring something from the future, the whole universe goes hay-wire. nature does not allow anything like this. so we may be just of the form of some energy that can not interfere with the environment of the new time! interesting no?\n\nhappy reading!\nhttp://en.wikipedia.org/wiki/Wormhole
676857
Assuming time travel is possible, I think such a senario might be possible.  The trouble people have with time paradox lies in the assumption that every thing in the universe shares the same time line.  Why should that be true?  Here's an example:\n\n\n------  X  -------------------  Y  ---------\n\nAbove is our theoretical timeline.  Y represents me, in the "present".  I use my time machine to go back to X, before my grandfather sires my father, and kill him.  Logic dictates that I shouldn't exist.  What I'm suggesting looks like this, instead:\n\n---------------------------  Y  ------------\n                             \n\n---------------------------  X  ------------\n\nX & Y still represent me & my grandfather, but each of us now possess our own separate time line.  Instead of "going back in time", I simply hop off my timeline & onto his.  I am now free to perform my assassination, without consequence to me (beyond the obvious legal ones), as I was not born on this timeline, but my own.  Whether or not I can now return to my own timeline is an entirely different question, however.
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!!
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
11171
yes, traveling forward in time is definately possible, but we're not sure about back.  This has nothing to do with wormholes or anything, that probably wouldn't work.\n\nanyway, velocity distorts time. The faster you go, the slower time goes for you. This effect is negligable unless you are going very close to the speed of light. In fact the formula is:\nt'= t/sqrt(1-v^2/c^2)\nwhere t' is the time that has passed for a stationary observer, t is the time that has passed for you, sqrt means square root and ^2 means squared. As you can notice, when v is small, since c^2 is so huge, you get a miniscule decimal, and 1 minus that number is basically as small as .999999999999999 or something very very close to one, and so t' stays basically the same as t and time is not really affected. As v gets larger(it can never be the speed of light, then the denomonator would be zero) that fraction becomes closer to 1, so when you subtract it from one, the denomonator gets smaller and smaller, meaning t gets smaller(in order for t' to remain constant) this means that time slows down for the object moving at such velocities! time slows down, so it would feel like lets sayThis formula is correct, it is part of Einstein's theory of relativity, and I have had to derive it myself from ordinary mechanics formulas. \n\nThis proves the formula:\nAccording to the same factor, length also contracts. It has been observed in certain tiny particles coming to the earth's surface. These particles have a certain lifespan before they become unstable and decay. They are also moving at a certain speed. (which is very fast; close to the speed of light.) You should simply be able to calculate v=d/t (velocity=distance/time) to find out how far they would travel. However, they somehow travel farther than that. When this calculated distance is put into that formula, we come up with the correct distance they actually travel! \n\nSo yes, as you get faster and faster, since time slows down for you, theoretically, you could be moving at these speeds for a short time and time will seem to be moving normally for you, but have years and years pass for everyone else, thus traveling forward in time. As far as back in time... well, if you think about it, if things travel slower and slower the closer you get to light, does that mean it would stop when you reached it? and what would happen when you went faster, would it go back in time?  the only problem with this is that nothing can go faster than the speed of light, which has been considered "the ultimate speed limit of the universe."  Plus, if you were to go faster, the v^2/c^2 would be greater than one, meaning you'd get a negative number after subtracting it from one and have a negative number under the square root in that formula.  This is impossible.  Also, the problem with even traveling forward in time is that it would require immense amounts of energy to accelerate objects that fast.  It requires particle accelerators miles long just to get small sub-atomic particles to go that fast, imagine massive objects, it would be crazy. and distorting time by any reasonable amount would require going at least 90% the speed of light.. probably faster.  The closer you got to the speed of light, the more time would slow down for you.\n\nThere are also some other methods described in the book "time travel in einstein's universe" by Richard Gott, if you're interested.
721881
I dont think time travel is possible! Even if you were to go faster than the speed of light, it still takes time to get to where you are going. And that brings up another question, where do you go?? Do you zoom around the planet a few million times? Which direction? Does it matter, it still takes TIME to do it.\n\nJust for argument sake, lets say you could go back (or forward) in time. I dont know why you couldnt be seen, you just traveled to a different time and when you get there your there, just as if you were to travel to a different city.
1065560
Anything is possible "if" another impossible thing is found to be possible; so long as the original thing is made possible by the formerly impossible thing.\n\nIn other words, of course time travel is possible so long as other impossible things become possible that would make it possible, such as your catalyst which would open a space and time rift.\n\nTherefore, the real question is not whether time travel is possible, but whether any catalyst does exist that would make it possible.\n\nThanks for the post!
723434
We would go back in time!
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
688804
In fact we indeed are traveling in time. But, only in one direction, i.e., towards the future; and that too, with a certain fixed 'speed' (call it, spending one second per second). Do you understand what I am saying? I am saying that we can not move backward towards our past, and , we have no control over the passage of time.\n\nThe special theory of relativity, however suggests a theoretical method to control the passage of time: Time dilation, which requires moving with speeds around the speed of light. The theory holds that, relative to a stationary observer, time appears to pass more slowly for faster-moving bodies: for example, a moving clock will appear to run slow; as a clock approaches the speed of light its hands will appear to nearly stop moving. However, this effect allows "time travel" only toward the future: never backward. \n\nMany in the scientific community believe that time travel is highly unlikely. This belief is largely due to Occam's Razor. Any theory which would allow time travel would require that issues of causality be resolved. What happens if you try to go back in time and kill your grandfather. Also, in the absence of any experimental evidence that time travel exists, it is theoretically simpler to assume that it does not happen. Indeed, Stephen Hawking once suggested that the absence of tourists from the future constitutes a strong argument against the existence of time travel - a variant of the Fermi paradox, with time travelers instead of alien visitors. However, assuming that time travel cannot happen is also interesting to physicists because it opens up the question of why and what physical laws exist to prevent time travel from occurring. \n\nFrom the above note, one can note two points:\n1. Time-travel is highly unlikely, and,\n2. Possibly, it is uni-directional (towards the future, not back to past).\n\nSo, it seems that knowing the future by visiting it is either not possible, or, once you are in your future, you can't come back to present to tell your friends that you know the future!!!\n\nPartly, knowing the future theoretically, is perhaps possible if you understand and meticulously use the principle of causality.