Is it possible for time travel if you go fast enough or would it just slow time down.
199357
So far time dilation is possible in the forward direction. That is if YOU travel away from earth in a very fast spaceship near the speed of light then turn around and come back. The people on earth would age more then you have. YOUR clock would be different then those people on earth. It would be faster.\n\nGoing backward in time is still up there.\n\nThere are many experiments that prove this to be true. Atomic clocks capable of high accuracy are sync up. One is put on a plane and flown around the earth at high speeds for a long time. When the two clocks were compared later, they showed a difference, a very small difference but a difference none the less.\n\nTake a look at this website. There are plenty of other site out there.\n\nhttp://imagine.gsfc.nasa.gov/docs/ask_astro/answers/050225a.html\n\nInterestingly, if you did travel at the speed of light, you would be anywhere and everywhere all at once... WOW! That blows my mind.    :-)
156610
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.
478669
Going faster than light speed violates the laws of special relativity.  You simply cannot start at rest or any velocity less than light, reach light speed, then get faster.  However, it does not violate special relativity if your starting velocity is faster than light.  This is how tachyons are hypothesized.  When a tachyon forms, it immediately starts which a velocity faster than light.  Therefore it can never slow down to the speed of light or less.  If tachyons exist, they'll give off a certain type of radiation so they won't be invisible. \n\nSo in other words, it will never be possible for us to make some spaceship or anything that can go faster than light, which means no "warp drives" or anything like that.
225098
There is nothing like antidirection. \nWell, if it becomes possible (assuming) to move at the speed of light, the time dilation formula of the special theory of relativity says that the time would not elapse. That means your aging will stop!\nIf it becomes possible (assuming) to move with speeds higher than that of light, many things could happen. According to the time dilation formula, the time would become an imaginary quantity. One of the interpretation of this imaginary time goes like this: the time will start moving backward. Possibly, that is the situation when you can expect moving back to past. But, further mathematics shows that you are not necessarily going to reach to your own past. Rather, you could land onto some other, strange, alien universe!\nAt this point we have not talked about the change in your mass or length if you are moving with such a high speed. But, for sure you are not going to be the same!
37614
I believe yes.. It makes sense, You see all of these dimensions are just directions. If you say that the four dimensions are represented by X,Y,Z,T these are merely directions of dimensions then all of those are travellable (meaning you can travel in those directions). You can go to left & Right (X), You can go Forward & Backward (Y), you can go Up or Down (Z). The questions now is how do you travel through time. According to Albert Einstein if there is anything that can go faster than the speed of light then it will be possible to travel through time. It is actually true becuase our mind can go faster that speed of light that whay our mind can travel through time, sometimes we remember things in our past that the way our mind travels.
112874
My belief:\nNo.  Time travel to the future is possible.  But time travelling into the past is impossible.\n\nHow to make it actually do it!:\nFirst you need a flux capacitor.  Then you need 1.21 jiggowatts of power, that you can only find in a lightning bolt.  Then connect these two together and GREAT SCOTT, time travel!
23177
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.
306420
Only if travelling long distances in time costs the same as short distances in time. In all the modes of transport I know, travelling long distances costs more than travelling short distances. Travelling long distances is also more dangerous than travelling short distances. Therefore, users can only afford to make a short ride back in time because a long journey is expensive and dangerous. \n\nSo, suppose it's Monday and Eric is the owner of the first time machine. Eric travels back to last Tuesday. There, his concubines Amie and Atria will be able to take the machine apart, so that Eric can't get back home, but Amie and Atria won't be able to replicate it, because they can't understand how it works, because the crucial part won't be invented until Saturday. The girls will wait until Saturday and then buy a time machine at the same store that Eric bought his. \n\nThus everyone who wants a time machine has to buy one on Saturday at the earliest.
74375
Time travel seems to make sense to us because we have the concepts of past and future.  In particular, we can vividly picture in our minds the parts of the past we have experienced.  The past can seem to have a kind of reality because of memory, as the can future because of imagination.  But, neither the past nor the future have any real existence.  There is only the present.\n\nTime is not a container like space is.  We can travel in space because other places really exist.  Time is not a container.  There's nowhere to go.  So, no, time travel is not possible.
26914
Maybe the more relevent answer is God does not allow us to time travel.  The Rules of This universe seem to suggest time Moves Forwards, and not backwards, though Stephen Hawking has noted that some subatomic Particles can briefly seem to move backwards in time, not at any significant factor that would allow time travel.  So maybe God ste up this "Law" so we cannot do what you wanted to do with the video tape, making the question seem Moot.  Or the other possibility..is say you could time travel, and you could video tape.  Human nature dictates, some people will believe, and some will be sceptical (see Doubting Thomas for reference)   We have video proof of the Moon Landing, Picture documentation of the Holocaust, and still some people believe neither event ever took place.
106335
Time travel is pretty much a sure thing, at least to the past.  Tiny little wormholes pop up everywhere all the time.  If one were able to be captured, and then expanded to fit a person through (say with antigravity from the casimir effect or a lazer) a time machine could be made.  Now there are a couple of hoops to jump through of course.  Wormholes have TREMENDOUS pressure, they pretty much crush matter to a single point (called a singularity), so you would have to find a way to survive the trip.  Now, the wormhole has a beggining and an end, two sides like a tunnel.  Now, very large and very dense objects tend to slow down time, so does traveling very fast.  Drag one side of the wormhole next to something VERY dense, like say, a pulsar.  Leave it close to the pulsar and then it will experience time differently than the other side of the wormhole.  Leave it there until there is a time differential between the two that you are satisfied with (like say a year or whatever), and then drag it back right next to the other end of the tunnel.  Now you have two holes in space/time in reletively the same place, but if you walk through one side, you will come out right next to it, but in a different time, dictated by that time differential that you created.\n\nThere are of course paradoxed assciated with this.  One is the famous killing your mother paradox.  If you go back in time and kill your mother, you will not exist.  BUT, if you do not exist you could not have killed your mother and therefore you DO exist and you kill her etc etc etc.  How about a scientist which goes to the future a couple of years, opens up a scientific journal, takes quick notes of a new theory, and goes back to his time and gives the info to one of his students.  This studen then works a few years perfecting the theory and has it published.  This just so happens to be the journal that the scientist had read.  Where did the information come from in the first place, did it just appear out of nowhere?  There are lots of logical problems with this, but by the time we manage to develop the technology necessary to do all this we'll probably have figured it all out.
557313
Theoretically possible. See: http://www.pbs.org/wgbh/nova/time/through.html
619814
the theories of time travel are extremely complex. it is often mistaken that one can use radiation or electro-magnetics to warp space into  an alternate reality. one of the popular theories of time travel is only from a certain point. what I'm saying is that we will not be able to visit this time from the future. \n\na few theories are;\n\n1: warping the very fabric of space, then accelerating to near the speed of light through the folds. the speed would then turn you body into pure energy, eventually reformulating somewhere in the future. Problems: 1; to warp space fabric would require more energy than it takes to make a black hole. 2; this is my personal theory.\n\n2: do you know how a worm-hole works? if not, ignore this section. but take an opening of a worm-hole and some how place by a point of high gravity (a neutron star). while at the same time directing negative energy at both openings in order to keep them from collapsing into a black hole. time slows down in super-high gravity, therefore if you throw yourself into the opening with no gravity, you'll wind up in the past. and vise-versa. Problems; 1; worm-hole technology is beyond our reach at this time. 2; worm-holes are flickering in and out of existence every infinitely small spec of time, therefore it is difficult to isolate one.\n\nas for what time travel exactly is, i could go one for about three pages.\n\nI'm a nerd. \n\nStargazer.
335632
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.
627132
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.
491462
Reverse time travel is impossible, but believe it or not, forward is 100 % possible. Then an object reaches an extremely high speed, near the speed of light, Time around it will go slower and the object willgo forward in time faster than everythng else. Astronauts in the space shuttle also travel throught time, but because their speed is only a tini fraction of the speed of light, their time travel is nearly unnoticed.
451176
I think that it is possible. Time is used to allow for the changing state of the other dimensions. Since there are three observable spacial dimensions the idea of multiple time dimensions offers some interesting insights that may help to create a TOE (theory of everything) that is simple, elegant and  consistent with our observations. It may well be that gravity is equivalent to "negative time" since it appears to be a force that is working constantly to   cause the universe to collapse into itself and back into the base state of the universe - as it was at the time of the big bang. The force we have been calling dark energy could be viewed as a manifestation of "positive time" - since it represents the force which causes the universe to expand outward at a ever accelerating rate.\n\nThis would mess up many other theories - but it might be consistent with Einstein's relativity and I think it makes the idea that acceleration is equivalent to mass easier to understand, especially as it relates to time dilation for the frame of the observer travelling at the speed of light, relative to time as experienced in the rest of the universe at speeds below that of light.\n\nSuch an idea also suggests that the difference between certain quarks may actually be their time polarity which could make a positron a kind of time reversed electron. \n\nGiven the relationship between the two may be time polarity it might be possible to equalize  the two - perhaps by feeding enough dark energy into the counter-rotating singularity around a black hole, which then might cause it to become a sort of super-temporal space - an strange infinite singularity that could never collapse because it is already been forced 'outside' of normal time and into a special kind of zero-time space. \n\nWho knows? Perhaps that was the cause of the big bang in a universe which existed before this one and when that universe collapsed it was the destabilizing influence that caused this one to begin.