Is time travel possible? Yes and no, but mostly no. During the research I've done into time travel, I've found out that the concept is more diverse than most people think. When talking about time travel, we must first understand there are different versions of time travel. We can either travel forward or backward in time and can either view it or be able to participate in it. These options give us four types of time travel. The four types of time travel: Viewing the past Participating in the past Viewing the future Participating in the future Each of these versions has their own specific answer, so we will go over them separately. The concept of whether we return to our original time after the travel is irrelevant, as we'll discuss later on. However, in order to understand whether time travel, in any of these forms, we must first understand the true concept of time and its relationship to space and matter. The definition of time that I use in this article is simple: "Time" is the passage of one moment to the next. This definition begs, "What is a moment?". A "moment" (for purposes of this article) is an instant defined by the position of all particles in relation to each other. For example, one well-known moment was the precise split-second when the bullet hit John F. Kennedy's head. I will use this moment as a reference point when discussing traveling in the past. With this in mind, let's work our way through the different types of time travel. Viewing the past This method is generally the one that most scientists talk about when they discuss time travel. When they talk about how time travel is possible, they usually talk about finding some way to travel faster than the speed of light. If a light beam is sent and afterward we activate time travel, we overtake the light and, in effect, see it sent off again from our new location. So when a "moment" occurs, we can head out beyond the light waves of that moment and see it again. Due to the immense distance required, this method is usually discussed in terms of traveling to solar systems far beyond our current capabilities. In this method of time travel, we have no ability to interact with what happened. We can only observe. The most notable example of this type of time travel is stars. We see the light waves they sent off years ago, but have no way of interacting with the occurrences because they: Are too far away Have already happened So with this in mind, we want to see JFK's murder. To do this we must travel faster than the light waves carrying those moments and view them. OK, so Friday Nov. 22, 1963, 12:30:07 PM CMT is the time we are looking to witness. Around Elm Street Dallas Texas is the location. In order to witness the event we must first calculate which direction that part of the Earth was facing so we know the best route to find the correct light waves. It does us no good to just zoom off past the speed of light. We would most likely head in the wrong direction. After all, the light waves from an event don't pass through the Earth and head out equally in all directions. Just as an astronaut on the other side of the moon could not get our attention with flares. So we calculate the approximate location of the light waves. Now we must catch up to them. Is faster than light speed possible? Not currently. It won't happen any time soon. Right now the most common theory as to how to do it involves bending space so you have a shorter travel distance than the light wave. However regardless of the theory and/or technique used faster than light travel still involves traveling through space faster than 186,000 miles per second. That's well out of our grasp so far. It will occur, but not yet. But for the sake of argument let's pretend 100x light speed is currently possible. A ship takes off in the right direction, speeds out, overtakes the light rays and prepares its telescopes and recorders. Now let's think about this for just a moment. Those light rays are going to be very far away. Well past the planet Pluto. Let's take our best telescope (Hubble, if I'm not mistaken) and point it at Pluto. Let's pretend the telescope is 100x more powerful than it is right now. How much specific detail do you think we can see? In a word, zero. Light dissipates as it travels just like any other wave. The details get blurrier the farther you go. This is simple physics. We make devices to clear up and focus as best as we can, but the fact is we will never be able to make a device fast enough or clear enough to be able to zoom in on the famous assassination. OK, so let's make things a little more reasonable. Let's pretend an attack occurred just 5 minutes ago and we can travel fast enough to see the event occur again 2 minutes from now. We can see what happened and head back to report the details missed the first time. That is, as long as they occurred out in the open. No light waves could travel from an event, out the window and bank up toward our spacecraft for us to see and no passive "x-ray" types of technology exist. They all require us to shoot something into the area and view the results. But since what we want to see already happened, we have no chance to "x-ray" anything. No decent information would probably be available. All this of course is still presupposed on the concept of faster than light travel, which is still much too fast for us yet. When (and if) FTL speed is reachable than this type of time travel will be possible. However in truth it is less time travel and more space travel. Is time travel viewing the past possible? Yes, but not yet. Participating in the past The classic concept of time travel in where we can travel back into time and meet Albert Einstein or our dead great grandparent. Could we do it with faster than light speed? Nope. No matter how fast we are, what occurred, has already occurred. Seeing someone pull a trigger and moving faster than light afterward could never bring you to your exact location before the event has occurred. So if this type of time travel is to be possible it must be done with some other method. The moment of JFK's death, while famous and full of interest, holds many details that must be discussed when considering time travel. Remember I defined a moment by the relative position of all particles to each other. In this case, the position of the bullet compared to the position of JFK's head. However, many more things were going on at that exact moment. Where JFK was geographically speaking, where every person and animal around them were, where objects around them were, etc. But looking at time travel with just these details is not detailed enough. A moment in time has many other factors including: Where the Earth was in relation to the sun, where the sun was in relation to the solar system, and where the solar system was in relation to the universe. That moment in time is defined by the location of every atom in the universe and their precise distance from each other. Consider traveling back in time to a nighttime situation. (Remember, it's always night time somewhere on the Earth) If our time machine only affected the Earth, then the Sun, stars, planets, etc would be in the wrong location, and a "hiccup" would be felt by all. So traveling back in time can't be accomplished by simply recreating the exact situation, since we must also recreate the position of the very stars. our device would have to affect the entire universe. This is entirely impossible. Under no circumstances could we ever affect the entire universe to replay a past event. Is time travel participating in the past possible? No. Viewing the future This concept of time travel involves being able to witness future events and travel back to the original time to what we would consider the present so you can act upon that knowledge. While it is very possible to guess at what the future holds (as many know I'm a big proponent of predicting the future, but that's for another article) Let's look at what this type of time travel requires. To view the future, we have to: Move forward to view the event Move back again to act on the information It's that second part that catches most people. As we already discussed, time travel to participate in the past is not possible. Once we witness and event, we can't go to a time before the event occurs. So we are stuck with only the first part. If we can view a future event but can't go back, we are then obviously pulled along the stream of time and by default interact with the future, which has now become our present. That is the fourth and final part of our discussion. Is time travel viewing the future possible? No. Participating in the future This is the theory that we are able to leap far ahead in time. For example, taking a one minute journey and ending up 2,000 years into the future. This is usually conceived in the "suspended animation" concept where time passes but your body is unaffected somehow. The best example of this is simple sleep. You close your eyes and in what feels like minutes, the entire night has gone by. The problem with sleep is that you are still affected by time, you were simply unaware of the effects. There is no method to move into the future with out the effects of time occurring on your body. There is no way to make time move faster and not affect the traveler. The problem is the same as traveling back. You just can't affect the entire universe. Therefore no "immediate" travel method into the future method is possible. However eventually we will be able to improve the "suspended animation" concept so that the effects of time are greatly slowed upon the target person. They will be unaware of their surroundings during this process. They won't be able to watch and wait until it's time to stop the ride. They will "go to sleep" today, and "wake up" further in the future. But, their travel will take the regular amount of time. Travelling 1,000 years into the future will take 1,000 years, no more, no less. As we mentioned up above, traveling back into the past isn't possible. So if you move far into the future, it's a one way trip. Once you move into the future to make it your present, you can never go back. Is time travel participating in the future possible. Yes. -------------------------------------------------------------------------------- http://www.rubak.com/article.cfm?ID=16

i used to think that i felt like that i was when travelling through other countries like egypt. your question reminded me of my travels. sorry it's not what you are looking for, but thanks for bringing back my memories!

In theory it isn't...but then again, there are alot of theories. In my opinion, time travel would be impossible in the sense that... -One's entity would be tranfered into a world where one would already exist...this can only apply to the 'soul belief'. -When one enters a different time, there's 100% chance that *something* will alter the future, meaning going into the past couldn't be possible if your future self will ultimately have lead a different 'path' and the same turn of events just wouldn't be possible. -The future travel just couldn't be possible either since you would have to 'terminate' the present self in order to go there...meaning there can't *be* a future self without a past self.

Yes, interacting with past events and future events. The only thing stopping us at this moment is the technology to spot opportunities in the warped space-time continuum and to travel at fast enough speeds to cause any real movement through time that we do not naturally do. The whole system of time travel is monumentally complex but possible. No-one can state when in the future we will have the technology but we do know that it is not beyond the realms of possibility.

all things are possible with the Lord

yes, but only going forward. if you want to go backwards...tough cookies.

Anythings possible you've just gotta put your mind to it

We are traveling through time as we speak. We are moving forward through time at what we could refer to as an increment of T=1. If we talk about moving faster than this, we are moving at T>1. This is moving forward in time. When we say we are moving slower than normal, we are moving at T<1. This is traveling backward in time. This is actually far more relevant than what most people would normally think. Technology that we use everyday, such as GPS devices and satellite phones, have to account for it. The passage of time is relative to the observer, meaning that time does not travel at the same "speed" for every object equally. In this instance, the the satellites are moving at a constant speed outside the deep gravity well that exists on and near the Earth's surface. Time is effected by mass and the gravity that goes with it. Because we are moving through time at what we have termed T=1 (the "normal" passage of time) here on the surface of the Earth, anything in orbit around the Earth is in a less-than-normal field of gravity. Therefore, the object, in this case, satellites, are traveling at T>1, because there is less gravitational pull in the orbit miles above the surface. In order for the whole GPS system to work, the devices on the ground have to account for this very, very slight discrepancy in the passage of time. If we want an extreme example, objects being pulled into a black hole experience tremendous gravity the closer they get to the singularity itself. As the object approaches the singularity, gravity increases so much that time itself slows down. Time, for this object, is traveling at T<1. The compression of the gravitational forces and the stretching of the fabric of space itself beyond the black hole's event horizon are so extreme that anything here will eventually experience an almost complete cessation of time itself. In other words, the object will virtually never be completely destroyed or absorbed by the black hole, because time itself has almost come to a complete standstill due to the almost infinite gravity and mass at the singularity. These events and situations were predicted almost a century ago by Einstein in his General & Special Theories of Relativity. Now, these things may not be just what you're talking about when you ask about time travel, but others here have addressed some very well made points about the more romantic ideas of time travel. So, I thought I would talk about some of the nut and bolts of the issue and show that it is not only believable, but it happens all the time! (Sorry for the pun!)

I think we are traveling through time as we use energy; to breath, think, and read and type on answerbag.

Even the Edgar Cayce method of time travel was a look only method. The akashik records are a fine example of that.

Sort of, you could travel across the prime maridian and you would either advance a day or go back a day. So yes, time travel is possible (sort of).

Actually on Letterman a few years back they had a brilliant scientist come on to speak about time travel. He had proven that constant high speeds could move time forward, for instance. One experiment he had done was put one "atomic clock' on a jet and one 'atomi clock' on the ground, both set at the exact same time. The jet flew around for hours going at extremely high speeds. When the jet returned the clock was about 2 minutes ahead of the clock on the ground. The scientist said that if someone was to fly at light speed for two weeks they would move over a billion years into the future.

Apparently so for certain types of sub atomic particles. I personally don't think people will be able to go forward or backwards in time. No wait... there's me from the future coming to tell me I was wrong.

According to Einstein's theory, time slows down when an object is moving. The United States military tested this theory by flying an atomic clock around the earth's atmosphere for 20 hours, and sure enough, it was .00004 seconds behind actual time. If you reach the speed of light, theoretically time would cease to exist, you would have no length width or depth, and have infinite mass. Think of it this way. Define "time," then forget that definition and read Einstein's atomic theory.

Maybe it will become , but for now, the answer is no unless you do spin around the earth faster than light thing, i never saw someone who time traveled, you know , time paradox...

It would be so cool if it did-.-- (=

I remember as a kid, the science teacher telling us that if the sun burnt out we'd still be seeing it and receiving light for about 8 min. 8 min after it exploded, we would actually see the explosion on earth. We would be sctually seeing the past. So I know that seeing the past is possible.

I think it's possible, since time is just a relative concept. Space can bend and therefore time will be affected. The relative velocities of objects can alter their comparative time references, as proven by the atomic clock experiment. ...and besides, when I'm late for work, I regularly drive at warp speed, often arriving at my office before I leave home.

I can only arrive at one conclusion that, we are only able to venture into the past and not the future because it hasn't happened yet. You better hope the wrong person doesn't discover time travel for it could spell the end of our existence.

YES,THE LAWS OF PHISICS ALLOW TIME TRAVEL,TODAY PEOPLE HAVE ALREADY TRAVELED THROUGH TIME,ASTRONAUTS HAVE ALREADY TRAVELED A FEW MILLISECONDS INTO THE FUTURE,HOW?WELL ONE WAY TO TRAVEL THROUGH TIME IS TO TRAVEL FASTER,AS FAST AS OR CLOSE TO THE SPEED OF LIGHT,TIME BECOMES SLOWER FOR THE TRAVELERS,SO IF YOU GOT ON A SPACE SHIP IN 2010 AND FLEW AROUND AT THE SPEED OF LIGHT FOR 10 YEARS,YOU MAY BE KEEPING TRACK OF TIME AND COME DOWN EXPECTING IT TO BE 2020 WHEN IT WILL ACTUALLY BE 2030 OR 2040.AS A RESULT,YOU WOULD HAVE AGED 10 YEARS AND YOU FRIENDS WOULD HAVE AGED 20 OR 30 YEARS.SO TIME BECOMES SLOWER FOR THE PERSON TRAVELING AT THE SPEED OF LIGHT.BUT I DONT KNOW HOW TO TRAVEL BACK IN TIME,SO IF YOU WANT TO TIME TRAVEL YOU MIGHT NOT BE ABLE TO COME BACK. WERT

Yes. You've all heard about the perfectly synchronised atomic clocks, right? One is placed aboard a supersonic jet and one is left on the ground. When the plane returns from its flight around the world, and the clocks are checked, it is found that they are no longer synchronised. There is a difference of a few seconds between them. This is proof that the time context of an object is affected by its relative velocity to everything else.

I believe time travel forward in time is possible, but if in the future people could travel back in time, wouldn't we have already seen them come back to our present?

I seriously doubt it. If it were dont you think that people from the future would have visited us?

Not with the science available now. Dimensional travel, because it does not require the massive amounts of energy to exceed light speed, (practically all the energy ever produced on Earth) may be practical once we prove that other dimensions exist. IN THE MEANTIME: Be content to know that you are constantly travelling into the future! Just try to remain in "today" or prevent "tomorrow."

I travel through time daily. Thats how all this works.

Without god nothing is possible. Plus time is an illusion it is human made because "time" as u say goes on forever. It is impossible without god.

Think about this. If time travel is EVER invented, even if it takes a couple billion years, all the effects of what those time travellers will do will already have happened and affected us today. There will be those first breakthrough scientists that are tinkering around in their labs and suddenly be pushed through time and space to end up in the crowds of people during Kennedy's assassination. Any mistakes or problems he causes while he is in our time period will already have taken place. However, as their study of time travel progresses back in this scientists home town, people will have realized the potential danger of this phenomenon and they will start to make laws against it (that's what humanity does with any cool new invention that comes out.) They will start to have time travel police, and time travel detectives, all of which will have already affected our lives today. In the end, they will have to make a decision. Do they go back and fix everything they've ever done to change history, or do they make a plan as to what's best for humanity, and make a few adjustments? One thing's for sure, they would not leave time travel to just anybody, and they would probably have to invent a way to abolish it forever. They would make their last minute adjustments and throw the dangerous idea in the trash. Everything will have been carefully planned out, and life will be perfect for us (at least in their eyes.) My main point is that we are already being controlled by the effects of time travel, but we can't stop studying it or we will never get to that point. However, we don't really need to try, because we already know it's going to happen, right?..... thus, this argument could go on forever. Just thought I'd put in my thoughts.

We're traveling through time right now. Second by Second.

I already answered this question next year. Seriously, no. The nearest we can do is travel forward in time by being put in suspended animation - asleep for long periods of time. But we could never travel back in time.

I wish! It is in Deje Vu & Back to the Future though!

I am not sure, but I can't get my brain around it. For me, for time travel to be possible it would mean that the future, present, and past all currently (not the best word, I know) exist in some way. That means that if we were ever to be able to travel back through time that we could go to 10 years ago and share the technology with our former selves. If that were the case, then we would already be able to time travel... get my drift? Blah. Thanks for a headache! :)

Some theories, most notably special and general relativity, suggest that suitable geometries of spacetime, or specific types of motion in space, may allow time travel into the past and future if these geometries or motions are possible. In technical papers physicists generally avoid the commonplace language of "moving" or "traveling" through time ('movement' normally refers only to a change in spatial position as the time coordinate is varied), and instead discuss the possibility of closed timelike curves, which are worldlines that form closed loops in spacetime, allowing objects to return to their own past. There are known to be solutions to the equations of general relativity that describe spacetimes which contain closed timelike curves, but the physical plausibility of these solutions is uncertain. Physicists take for granted that if one were to move away from the Earth at relativistic velocities and return, more time would have passed on Earth than for the traveler, so in this sense it is accepted that relativity allows "travel into the future" (although according to relativity there is no single objective answer to how much time has 'really' passed between the departure and the return). On the other hand, many in the scientific community believe that backwards time travel is highly unlikely. Any theory which would allow time travel would require that issues of causality be resolved. What if one were to go back in time and kill one's own grandfather? Additionally, Stephen Hawking once suggested that the absence of tourists from the future constitutes an argument against the existence of time travel—a variant of the Fermi paradox. Of course this would not show time travel is physically impossible, only that it is never in fact developed; and even if it is developed, Hawking notes elsewhere that time travel may only be possible in a region of spacetime that is warped in the right way, and that if we cannot create such a region until the future, then time travelers would not be able to travel back before that date, so 'This picture would explain why we haven't been over run by tourists from the future.' However, the theory of general relativity does suggest scientific grounds for thinking backwards time travel could be possible in certain unusual scenarios, although arguments from semiclassical gravity suggest that when quantum effects are incorporated into general relativity, these loopholes may be closed. These semiclassical arguments led Hawking to formulate the chronology protection conjecture, suggesting that the fundamental laws of nature prevent time travel, but physicists cannot come to a definite judgment on the issue without a theory of quantum gravity to join quantum mechanics and general relativity into a completely unified theory. If one were able to move information or matter from one point to another faster than light, then according to special relativity, there would be some inertial frame of reference in which the signal or object was moving backwards in time. This is a consequence of the relativity of simultaneity in special relativity, which says that in some cases different reference frames will disagree on whether two events at different locations happened "at the same time" or not, and they can also disagree on the order of the two events (technically, these disagreements occur when spacetime interval between the events is 'space-like', meaning that neither event lies in the future light cone of the other). Wormholes are a type of warped spacetime which are also permitted by the Einstein field equations of general relativity, although it would be impossible to travel through a wormhole unless it was what is known as a traversable wormhole. A proposed time-travel machine using a traversable wormhole would (hypothetically) work something like this. One end of the wormhole is accelerated to nearly the speed of light, perhaps with an advanced spaceship, and then brought back to the point of origin. Due to time dilation, the accelerated end of the wormhole has now aged less than the stationary end, as seen by an external observer; however, time connects differently through the wormhole than outside it, so that synchronized clocks at either end of the wormhole will always remain synchronized as seen by an observer passing through the wormhole, no matter how the two ends move around. This means that an observer entering the accelerated end would exit the stationary end when the stationary end was the same age that the accelerated end had been at the moment before entry; for example, if prior to entering the wormhole the observer noted that a clock at the accelerated end read a date of 2005 while a clock at the stationary end read 2010, then the observer would exit the stationary end when its clock also read 2005, a trip backwards in time as seen by other observers outside. One significant limitation of such a time machine is that it is only possible to go as far back in time as the initial creation of the machine;[9] in essence, it is more of a path through time than it is a device that itself moves through time, and it would not allow the technology itself to be moved backwards in time. This could provide an alternative explanation for Hawking's observation: a time machine will be built someday, but has not yet been built, so the tourists from the future cannot reach this far back in time. According to current theories on the nature of wormholes, construction of a traversable wormhole would require the existence of a substance known as "exotic matter" with negative energy. Many physicists believe this may actually be possible due to the Casimir effect in quantum physics. Although early calculations suggested a very large amount of negative energy would be required, later calculations showed that the amount of negative energy can be made arbitrarily small. In 1993, Matt Visser argued that the two mouths of a wormhole with such an induced clock difference could not be brought together without inducing quantum field and gravitational effects that would either make the wormhole collapse or the two mouths repel each other. Because of this, the two mouths could not be brought close enough for causality violation to take place. However, in a 1997 paper, Visser hypothesized that a complex "Roman ring" (named after Tom Roman) configuration of an N number of wormholes arranged in a symmetric polygon could still act as a time machine, although he concludes that this is more likely a flaw in classical quantum gravity theory rather than proof that causality violation is possible.

Did you watch Donnie Darko. He did time traver. Great movie. Anyway, maybe.

Let the experts talk: http://www.rosecroixjournal.org/issues/2004_vol_01/articles/vol1_01_09_amaral.pdf

The idea of time travel is really a logical fallacy. Just when you are ready to take one stance, another arises, so its almost impossible with current technology to say yes or no indefinately. If you say yes, then there comes the question "If time travel happens, wouldnt the theoretical "post time travel change" be our current reality?" Or is time travel where you can go back in time and change the future completely. Also there is the thought that if you go back in time and breathe on the wrong person, animal, anemorphic goo, that you will change the world the way it is today. I have a feeling that if time travel did exist, that we would know it already, and that it just dosent seem to be a logical possibility, until someone has exact proof of how it works, and how it effects our world. Now something a little more logical would be the question of if we can reach speeds that would change time, or rather our perspective of such.

I say No - because of the speed of light. I think it influences worm holes or any other means of time travel - and since the speed of light cannot be surpassed then I conclude that time travel is fantasy.

We are all time travelers. From the moment we are conceived to (at least) when we die we travel from one point of time to another. I know that that does not appear to go with your question, however it is important to establish what we are in relation to time to understand moving against or outside of the flow of time. There are theories out there which suggest that time travel is possible. Such as relativity which present us with the Twin Paradox where one twin goes on a very fast voyage at over 30% the speed of light and time Dilation leads to the earth bound twin aging faster than the traveling twin. In effect the twin who returns younger has "traveled" forward in time. Star Trek also played around with another theory which is a real theory. However we are uncertain if we can throw people back in time. The theory requires a heavy gravity field and velocity. We are speaking of speeds in percentages of light speed and we are talking gravity fields that are associated with Neutronium - that is a material where the collapse of the atom has "crushed" the particles together. As you may know the atoms have lots of space, even between the protons and the neutrons. If one can crush those atoms down to where the electrons and protons and neutrons are touching the electron proton pair bonds becoming a neutron all of the material becomes neutrons - a neutrally charged atom which is very, very dense. The next density of the atom would be a black hole. Gravity bends space and time. We know that between the planets time moves a very small fraction of a nano-second faster than in the gravity well of earth. On Jupiter it is assumed that an even smaller fraction of faster speed is found on Jupiter. On the sun its a little faster - on a denser neutron start even faster. Add in speed and it is possible to "whip" around and propelling the vehicle through time - it is assumed that it would "Jump" ahead in time. Some have theorized that if you spin the super dense gravity field one way you travel forward, spin it the other and you throw things back in time. This is only theory, the maths fail when plotting a backward trajectory through time. It requires a tad bit more physics than we have and understand. It most likely requires the same physics that would have existed before the big bang. There are other theories such as time particles. If you have watched science fiction shows like star trek this may sound familiar. (it is called science fiction not because it is all made up, but because some science is in it). If they exist then they may be something we can control and use, much like we can control and use atomic particles today. 300 years ago we had no idea that particles really existed. Today CERN and LLL play with particle accelerators on a daily basis. In one of the science journals I have read recently there was a successful teleportation of particles done. This was an unthinkable possibility a few years ago - now that it has been done suddenly there is a whole new light being shone on teleportation - It is possible that this new discovery will open the doors to real-life transporter technology. Not so much in the sense of Star Trek, more in the sense of The Fly where there is a transmitter and a receiver. It is possible that there are ways to manipulate time that do not require massive energies or gravity fields. My Physics Professor loved to say: "Anything is possible, its possible to strap on a large enough engine to make a barn fly. Not all things are practical, meaning we shouldn't expect non-stop flights over seas by barn anytime soon" so it may be possible to travel through time, however it may not happen because it is not something that can be done practically.

I dont believe so.

A lot of talented individuals have put theories forward over the years but none have practically achieved this. So it would be a fair bet to say no.

what about a black hole and dementions?

No, that would defy most of what we understand about space and time. There 'is' however, a phenomenon called 'time dilation', which effectively lets someone/something experience time at a slower rate (though they perceive it as running at normal speeds) while everyone else experiences it as usual. This is achieved by travelling at or near the speed of light, and I think that we have observed it happening in sub-atomic particles moving at extreme speeds. To give it a better example: Lets say we invent a space ship that travels at the speed of light, someone inside that ship sets off on a trip that they time on-board their ship to be 5 years long. When they return to Earth after what they think was 5 years (having travelled at the speed of light the entire trip), time on Earth has actually advanced 20 years. <- It could be much a much larger or smaller difference in time, I actually have no idea what it'd be... This is just an example : P It's important to note that this is ONE WAY, we can NOT go backwards through time, only experience an accelerated forward rate. ***** Understand that this is just a prediction made according to Einstein's Theory of Relativity - that is to say, if his theory is correct, this phenomenon is possible. ***** Hehe, also understand that this is just 'my understanding' of the concept of Time Dilation, I could very easily have butchered the concept and just typed out a load of nonsense, please forgive me if this is the case ; ) lol

i have heard of this but in a more simple explanation. the few seconds b4 impact that time seems to stand still even when going 50 mph...i also believe einstiens theory and quote " time is an illution however persistant"

well first of all time can be difined as a tool made by us so that we could manage ourselves, it's not something you can touch or see, time is something you feel. from that prespective time travel cannot be achived by circling the earth or so, you cant go back to tommorrow you cant go back even one second, becuase it's not simply a small stroke or movement in a watch, can you imagine all the things that could happen in just one second all around the wolrd? when the answer is yes and you can then you should ask yourself can all those things that happened be undone all at once with a time limit of one second?

O.K, I don't believe in time travel (please don't shoot me)for the reason that I don't believe in time 'being' in a way that could accommodate time travel. For me, time is the measurement of the universe's ever changing state. Like the universe time is infinite, in that it has no beginning or end. Similar to this is cause and effect, since every cause has an effect and every effect has a cause - there can have been no first cause - cause and effect are an infinite process. Since time is a reflection of changing state, not like stills in a movie, but an actual metamorphosis - the only way to travel back in time would be to reverse the entire universe, molecule by molecule, atom by atom, back through it's changing states to exactly as they were at 'the time'. This would not rule out the ability to see the future (if you new the exact current state of the universe and all the effecting parameters or 'causes of future events' and 'causes of current events' then you would accurately be able to look forwards or backwards in time - however, this would mean knowing the entire nature of the universe. You could also look backwards in time by flying to a very distant planet much, much faster than the speed of light and looking back at the Earth with a highly powerful telescope - but this technique does not equate to time travel as all you have done is reach this far away place faster than many years of light, and on returning at such speed, you would have just been and gone very fast and the world would have carried on as usual. Hope this didn't drag on too much. ;)

I think that time travel is possible but A/c to the relativity theorem we can only have a future travel but not a past travel. Many minds say that black holes are the entries to another time but I don't think that anyone who goes there can ever find his way back home.

Personally, I highly doubt it. First of all, because There would be known moments in history where someone perhaps said,in public , they were from the future, unless, of course, there were strict guidlines and security in the future capable of hindering or stopping this type of occurence. Also, and this is more of a personal wonder, what would happen if you went back in time, and met yourself ? Being both the same person, would you merge ? more than that ? wouldn't you know it now ? Or, if you did know it now, and you grew up and changed that, what would happen then ? It would obviously get rid of your past memory, but then, what would it be replaced by ? Just some insight. All the same, I think it would be AWESOME !!

The phrase, you cant change the past, just might not be true. We hear it all the time. Everyone believes it. Belief is ninety nine percent of what makes things work. Unbelief is a sure killer to any new project. Time is just for the living. When one is dead, time is no longer a factor. The dead can travel through time at will. Because they have no effect on what is happening in time. Having said that, if the dead could contact the living, then we might be able to learn from the past and the future.

I would not doubt that it is already done,but hidden from public view.

What dreams are made of. Time travel is a fantasy that personally I do not believe can become a reality (my opinion). I think many wish it could happen but fail to see all the bad that could come if it ever was possible. Right now it isn't possible. As for the future, personally I say don't give up the dream it only dies when you decide to give it up.

Interesting article here about the topic: http://astrophysics.suite101.com/article.cfm/is_time_travel_possible

There is an opposite to everything, the proof is age. Time Travel of particles have already happened...The question of Human Time Travel is questionable...Energy travels both directions of the spectrum. Visibility is the subject of discussion. The human brain is the receiver.

Only if we can think of a way to bypass Einsin's speed limit for the universe. If done, time dilation would serve as a suitable time machine--and don't forget wormholes!

For the moment we can still travel in our past by recalling our memories of the past events. We still can see our loved ones and the happenings that we cherished.This ability is almost instant and everybody can travel. That is about all the limits god permits on us becos he knows the human behaviour ,who will be tempted to change the past to benefit the future hence will upset the time continum and the balance of matter in the universe. Therefore giving more job for god to rectify.Traveling through time and space only belongs to God's will and power.

yes, I am from the future!!!

not yet, but if you can really want to go to past you can achieve it in your dreams i think =)

yea. but theyre not even close to perfecting it. and it can only send back some ver y very very small.

From what i have heard i think it is possible, HOWEVER it is nor feasable. I thinl i read in one of Einstiens works, that time travel is theoretically possible, but not feasable, because it would require all of the energy in the universe to achieve. So yes it might be possible, but unlikely to ever happen.

Every body is a time traveler, we all travel through time at the rate of time, no slower and no faster.

If you're high enuf anythings possible.

ask God

We are travelling through time at 60 seconds per minute all the time. But any true starship [one capable of exiting the universe and reentering it elsewhere] should also be a time machine.

No, but I sure think it would be fun...depending on the time in history you went to.

Yes, and probable in the future.

Nope Einstein's wrong. If it was possible don't you think someone from the future would have appeared by now.

Actually ... we are all timetravelers...just in a fixed pace and direction

I hope its not possible because if it is made possible, the powers that be will only fu*k things up more for the rest of us. Sooner or later it will have military applications and all they want is to use that kind of technology to smash the opposition.

you are doing it right now , just foward , by the second .

i have a cardboard machine I have been perfecting for years soon u will see it is!

In my experience, it most certainly is. :):)

no i dont think time travel is possible...what is gone is gone we cant go back into it and fix it

Mentally yes. I recall times in the past, and sometimes I fantasize changes. But physically? Maybe. We can transmute elements nowadays. (ok in small quantities) and we can make diamonds out of the remains of people. Never say never.

Yes! There are two people who have made serious inroads in this department. One is a scientist from the University of Connecticut (I believe) and the other a Russian scientist. I'm sure if you googled time machine and UConn, you'd get a hit or something in the right direction. Also, check out a website called "thefutureofthings.com"

yea you are doing it right now . just foward miliseconds at a time.

not that i know of but im shure it is

The equations for temporal mechanics seem to indicate that theoretically it is possible to generate an inversion field to alter both the time line's speed and direction, yet we still lack the ability to make and control this energy field ... ... so, theoretically yes, but in actuality no, not yet ...

Yep; just google it.

As soon as i find out, ill come back in time and let you know.

Yes it does exist and we all do it every day. Let me explain my theory. Time traveling is, simply put, Instantly going from one time to another. When we fall asleep at a certain time we feel like we are automatically transported to another time when we wake up. Who has ever fell asleep and woke up going. "What time is it?" Sleeping is our time traveling but we just don't know it.

yes every time you drive from one location to another.