The fictional concept of travelling in time;could it be true?
148250
We *are* traveling through time as we speak. We travel through time at a little less than the speed of light.\n\nFor every meter per second we move, we move a meter per second slower through time. Thus if we were to get in a spaceship and travel at half the speed of light through space for an extended period, then we would be moving through time at approximately half the speed at which everyone on Earth would be.\n\nWhen we returned to Earth and left our spaceship, we would discover that everyone else had aged twice as much as we did. So it is possible for us to travel into the future at a rate faster than one second per second, but it requires an extraordinary amount of resources. Consider that given Einstein's calculations to be true, the largest time displacement humanity has yet reached would be somewhere at about a second (set by whoever's been in space the longest, because in orbit you're traveling at 17,500 mph).\n\nTraveling to the past is impossible now, although we maybe be able to temporally distort a wormhole, allowing travel back to the time that the wormhole was first distorted; however this is yet to be proven or tested. We currently have no way of "grabbing" a black hole and moving it through space.\n\nI hope this helps.
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.
506183
I don't think it is possible.  If it was possible, it could sure mess up current events...or would it mess them up or fix them and what would the consequences of their actions be in the long run.  Hypothetically, it can be quite a conundrum really.  I really don't think that we, as humans, have even the remotest possibility of messing with time.  It is, and will remain, in the realm of fantasy and science fiction.
1113547
I have done time travel. Evertime I come back to California from Japan. I leave around 16:00 in Japan and get home around 09:00 . Sounds like time travel to me.
691265
Yes, did read about time travel when I was a kid.\n\nIf you are thinking of just being a passive observer, then a natural time machine is readily available to everyone. When we look at the stars, we are seeing the light of the past. The nearest star is 4.5 lightyears away, so we are looking at events that had happened during 2001. Other stars are even further away, so the light source carries information that are even older.\n\nThe images of the Earth, our Sun & the other planets in our Solar system are also being carried into space and this natural "moving historical records" are being beam into deep space. If there is a natural reflector somewhere out in space, we may be able to see such an image being reflected back to us in theory, so we could potentially see our own past.\n\nPhysically, traveling into the past or future would be a great many orders more difficult.
297213
Tough to believe I agree. I just spent the last couple hours surfing for other information and opinions. I find the time travel theory plausible. My first question was if his mission was to go to 1975, what is he doing posting in 2000-1? The personal request from his grandfather strikes me as checking on a change to the timeline. So true or false? I am leaning towards true, but if he changed this timeline then future as he describes it is moot. Check out the site below, I found it interesting.
1156662
No we cannot. The time travel stories are our over enthusiastic mind's work. It just cannot be possible. Unless we attain speed of light. Do u believe in relativity? think about it... maybe u will find answers there.
248955
I don't think it is possible, and if so the experiment itself would probably detroy the fabric of our reality to the point that people's answers would disappear, and reappear as different answers. The time machine does make for some fine fiction, though.
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.
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.
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...
56785
Yes, time travel is possible. :)\n\nIf you put a person in a rocket that can accelerate up to near light speeds on a round-about trip, when this guy comes back, he'd have aged much lesser than the guys who sent him. So he has travelled forwards in time.\n\nTravelling back in time is also possible. Oscilatting in time is possible. Time statis is also possible. All if we imagine a universe that has only a few elementary particles.\n\nHow? Well imagine a universe that has only a pendulum that swings back and forth. Now, we, as observers of this pendulum, can make the following observations, all different, and all "correct"\na. The pendulum is swinging back and forth as time advances\nb. The pendulum swings forth, then the direction of time reverses, and the pendulum goes back in time and swings back\nc. The pendulum is swinging forth and back as time retreats\n\nWhich of these is correct? We can't answer that question. So we can choose any one - it doesn't matter. These three are just different ways of looking at the phenomenon.\n\nYou may also want to read up about Feynman's diagrams
62229
Actually, yes. traveling forward in time is definately possible, but we're not sure about back. \n\nVelocity 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.
1042619
Well, it is a fantastic concept! Also, even if this could happen, it would take billions, if not billions of years!\nAnother way is that who and why do we accept the time direction as we do now? Because it fits, us! Well, sometimes this concept is reversed! SO, time could go the other way or go faster or slower, but this only in certain moments, yet!
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?
589080
I don't accept the premise that a time machine is possible, therefore I can't answer such a question, even hypothetically. I can give you a proof that time travel into the past is impossible. It goes like this. If time travel into the past were possible, then at some time in the future, the means to travel into the past will be developed. That being the case, then we could expect to have been visited by time travelers from the future, but we have not. Ergo, time travel into the past is impossible. However, time travel into the future is possible. From the time I started typing this answer, up to now, I have traveled into the future about two minutes. However, it is still now. It is always the present. Always and forever.
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