Is time travel possible in theory?
361317
Both could be entirely possible in theory. However the only problem comes in how to accellerate to above the speed of light, which according to Einstein is necessary to travel in time. Ont theory is to get to the highest speed possible and slingshot in a planet or stars gravitational rotation and use that to accelerate faster while using a rotational acceleration thereby accelerating to the poroper speed for it. That's sound as well, but it's hard to get funding for stuff like that and it's dangerous, because much like Back to the future and Star Trek, only nuclear fuel would provide the power necessary without adding too much weight to the vessel, and will not deplete for the radiation off a nuclear reation last for several thousand year depending on the element used.
1186293
I think i read on here somewhare that Albert Einstien said that time travel was impossible but time seeing was a possibility.
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
4398
If you actually care, read "Time Travel In Einstein's Universe" by J. Richard Gott.  It actually proposes multiple ways this is possible.\n\nMy favorite which I learned in physics class is the fact that velocity warps time.  The closer you get to the speed of light, the slower time moves for you. I've read this, and it is definately true, we had to derive the formula in physics, and calculate the time, lenghth(which decreases with speed), and mass (which increases with speed) distortion as well. The new time which has passed is equal to the time passed of a stationary observer over one minus the square root of velocity squared over the speed of light squared.  The effects of this are very negligable unless you are moving at speeds very very close to the speed of light, at least over 90% of the speed of light, and we haven't gotten anywhere close yet.  But theoretically if you were traveling very close to the speed of light, you could rotate the earth for what seems like days to you and then have years pass on earth, thus in a way traveling into the future.  Also, it gets slower and slower so that it is thought that time would actually stop if you were moving at the speed of light, and so now what happens if you move even faster? Some think it might cause you to go back in time.  It is impossible to travel faster than the speed of light, however in his book, Gott discusses looping around strings(the strings from string theory) which warp space time, and discusses ways to "beat" light and actually show up someplace before you left.\n\nTime definately slows down with velocity, therefore time travel definately occurs, however, i actually have a problem with the time travel of humans.  Because along with time dialating, mass also dialates, and length contracts, if we were to approach speeds significant enough to distort time, our mass would increase and length would decrease.  Now since density is mass over volume, wouldn't that mean that our density would increase dramatically? wouldn't our blood then become so dense and viscous that it prevents blood flow and our cells become deprived of oxygen and we die? Because of this, I find it unlikely that we will ever be able to time travel, but if we can accelerate objects enough, we will probably eventually be able to send other things into the future.
27421
It is not known whether this is possible or not right now. So it is possible that it's possible. :-)\n\nFor example, several credible scientific theories postulate the existence of parallel universes that can be accessed via various ways. Most of them would only allow one-way travel right now (like through a black hole), but the physics are not fully understood, obviously. It is possible that we could find a different one-way path back to this universe from the other one, for example.\n\nSee the article below for some conjecture from one of the great physicists thinking about these things. He wrote the book "The Elegant Universe," which also makes for interesting reading about these types of things, and gives a layman's introduction to string theory.
479777
I doubt it, I think it's just one problem that someone put forward to explain why Time Travel would be impossible, some of the first examples given were the Grandfather Paradox and the Butterfly effect but loads of Oxymoron's exist such as "American Military Intelligence!"  but what's the point of being an oxygen breather if you can't be a moron :0)
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!!
281323
We live in a four-dimension universe, the fourth dimension being space-time. Time travel is THEORETICALLY possible. Just be careful if you go too far back in time and accidentally kill your father. Think about it!\n\nGod is spelled B-I-G B-A-N-G\nPBrax@netscape.com
312777
Yes, there's still research going on. And yes, the theory still holds that if we could find a wormhole and create enough anti-matter to widen and stabilise it, and then find a way of surving the journey, time travel might be possible.\n\nBottom line, everything that's a theory today will either be proved or disproved somewhere down the line. Some things, like wormhole time travel and single-lifetime interstellar travel are the scientific equivalent of steeplechases - races with big old obstacles in the way. They might seem impossible at the start, but once you start running, you either have to figure out how to leap over the obstacles or fall down at them. But human beings are good at steeplechasing - look at the challenges we overcame between 1899 and 1970 - we couldn't fly when the century began. By the time we were seventy years in, not only had we fought two world wars in the air, we'd successfully landed on the moon. Who knows what we'll achieve by 2070...
630252
Teleportation. We at least have theory on how teleportation could work. If the universe under discussion permits of time machines, then no time machines will be invented. The noted s/f author Larry Niven wrote a couple excellent essays on these topics, which I recommend to your attention. They will provide all the information you could possibly need.
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.
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.
85344
Based on the relativity theory, there are many studies that are taking place to look into the possibility of traversing the time-space continuum.  As far as I know, we're not quite there yet.  But if and when we are, we should be able to tap into the theoritical "worm-holes" to go into different points in space without having to exume too much time.
551619
These answers sound pretty good.  However, if the fantasy idea were real and I looked up teleportation in the dictionary, which is based on common usage, I suspect I would find 'time travel' as the definition.\n\nWith my two cents, Teleporting would be a method of time travel, as opposed to others, I guess like OBE's.  I'm sure there would be more than one way to time travel by then.\n\nYou might not be the same person, Star Trek transported people out and back without their diseases or illnesses as a cure.  But if you did the sling-shot effect, using that method as opposed to teleporting you would be the same person.
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.
50046
I agree with the above answer....but think about this for a second.....if time travel ever becomes possible...we would all travel back in time to clean up stuff and change what we think we need to.....and since no one has shown up to change anything recently.....it just shows that time travel will never happen....