There is no doubt, that travel to the future is possible. If you traveled an extremly fast speed to far-away destination and back, you would see earth in the future. All this have no value without travelling to the past. Only if you can use information from the future to make decision in the past is timetravel interesting.

So, I am curious about travelling to the past. Is it possible?

At this time neither is "possible"

I wish we could travel to the past! I would go live back in the late 1700's or early 1800's ! Now that would be cool!

when i was young, i'd think it'd be good to take a bunch of money then go back in time because a dollar was worth more way back when. when i'd gotten older i realized that what the money looked like had changed over the years and they'd think what i had was simply fake money.

If once timetravel is possible, it is always possible. Anybody who masters time can move in future or past like you move forwards or backwards on the road. It is not important "when" but "whether".

I don’t know whether timetravel is possible, but I think that impossibility of travelling to the past means that everything is already given. Our past likewise our future. You can’t change what was happened and you will decide to fulfil one possible future.

I agree with you 100% that travelling to the future is possible, it's just a question of how far can you go. When astronauts travel to space and back, the amount of time the spen in space, and the amount of time it takes on earth do not match, that's a fact. Now, we just need to figure out how to go farther. Albert Einsteins 'theory of spacial relativity' basically says that the more you aproach the speed of light, at more time speeds up. If you think about it, we are travelling in time at a rate of 1 minute per minute, and by using einsteins theory, and alittle help from NASA, we could go into the future, no doubt about that. But, the question is, can we go into the past? At the time, I don't have an answer to that, but I do believe that anything is possible, and anything could happen.... you just never know.

A tricky topic. If you could go into the future, why not the past? But then again is the past set in stone? My guess would be that we would make a parallel universe, thus we ourselves would know, but everyone else would know it as everyday life. But if you think of it in terms of math, lets say you have a 1 ft board. You can add 2 ft and you get a total of 3 ft. But if you have a 1 ft board, you certainly cannot subtract 2 ft of board, leaving you with negative ft.

Oh yes, if you have one apple and two children, you can’t give one to both leaving you with negative apple. But past already have been, so past is (or was) possible. Whole your life you are adding 1 ft boards, if you have better technology you can add 2 ft (or more ft) boards.
Question is: can you take added boards back? (Saying in your terms of maths.)

To my understanding, it is not possible to travel backwards in time, due to the inherent paradox of movement.

The only way to travel in time is to separate yourself from the current timestream. Let's say you have an incredible advanced English phonebooth that allows you to do this. As time around the phonebooth displaces from the time in the environment, your relative time and the actual time gets further and further apart. This would indicate a movement into the future. However, as the displacement returns to normal, the time differential also returns to normal, eventually bringing you back to the exact instance you began traveling. In other words, a time machine could take you into the future, but it could only take you as far back as when it was first activated. Going into the past would become impossible, because the moment that you move backwards, you are at a time before you began moving. This would create an unbreachable paradox.

Yeah, i believe in it.

I don’t understand. I enter to the phonebooth and move to the future, so future will be my time likewise this time is our time. What is different? Why you say in my "future present" I can travel to past, but in my "current present" I can’t travel to past? I think, if you could breach paradox of future people, you could breach our paradox, or you can breach neither paradox, (so you must remain in future).

I was watching a show on the discovery channel a while ago. These people made a machine which was just about finished. And the inventor said that the only way to travel both forwards and backwards in time is if there was the same machine activated in that time. That's because the thing or person you send there has to go somewhere, it can't just drop anywhere. What I am saying is that something has to recieve it. So the very instant you turn on the machine, someone from the future could send you a letter, for example. I'm not sure if he finished it yet, he said that he will finish it some day, it's just a matter of time and money.

The reason you can return to the past, but not go to the past, is this. Let's say you activate the phonebooth at time A. The phone booth now creates its own chronal displacement B, which begins to seperate from A. The greater the displacement between A and B, the farther into the future you are. Let's say that you arrive at time C in the future, that time C is the Present to its timeline, and to you, however, to the phonebooth and everything within it, time C is nothing more than the displacement of A and B. Getting back into the phonebooth, you begin to draw the two displaced times together. As the displacement gets smaller, B returns to to its original time, A. Once it has returned to A, it cannot displace anymore. It is back where it started. If it wanted to go further back, it would have to displace within itself, and it can't do that.

if i ever get the chance to travel back in time, then i will for sure do it and change somethings but the possiblity of that are low, because you can't basically change something that happened to you in the past but if you go into the future you aren't really changing anything, just seeing and doing something new.

I wish I could go back in time. Just to get that innocent feeling of a child agian, seeing me, so inncent without worries, fishing and playing. Brings back sad memories I long for...

Here is the time paradox. If I go back in time to before I was born, and shoot my mother, what happens?

I never came in to being.

Which means that my mother never got shot, since I did not exist to shoot her.

In which case she did give birth to me.

Which means that I did exist to be able to go back in time and shoot her.

In which case I never came into being.

And round and round it goes.

Bear in mind, I have no desire to shoot my mom. I just use that as an example to show the potential for paradox. A thousand other things could create a paradox.

Lets say it's possible. After all, time is something, and everything can be changed somehow. But what would happen if we traveled back to the time BEFORE time existed? And, when was that? I mean, if there wasn't anyhing, time just couldn't exist either, right?

(Sorry... I just can't explain some stuff at english.. I nearly can't explain them in swedish either... )

And why your person (travelling to the future) doesn’t need something to recieve it?



Oh, I see... There is no "real" timetravel, only displacement between two points, and you say negative diplacement doesn’t exist.

I don’t believe your theory. I think that you, your grandfather, and your grandson have same chances to timetravel. And your unbreachable paradox of travel to the past (I suppose that you meant same paradox like Independent1) is also applicable for your future phonebooth. I give you an example:

You will go to the future and you will find, that your son began nuclear world war. After your return to our time you will kill him before he grow up. No nuclear war will begin in future, because of your son’s death. But how you could get knowledge what happened if your son survives? Your son was dead when you was in future, so there was no reason to kill him after you return...

Or you meant another paradox that obstruct travelling to the past?

I know this paradox very well and I have two solutions:

A ) You create another reality. You bifurcate timeline, in first branch you travel to the past to kill your mother and in second you don’t exist because your mother was killed by visitor from the future.

B ) You go back in time and you shoot you mother. This cause that your reality is destroyed exepting you. You will remain as anomaly and you will be only person having knowledge about world without shooting your mother.

Both is only theory, but I prefer second one.

No, the paradox that I'm talking about isn't theoretical, it's practical, in the sense that it cannot be avoided. Displacement is 'real' time travel, for all intents and purposes, but it remains relative for the form of transportation (the phonebooth). The phonebooth can travel forward as much as it cares to displace, however it can only travel back as much as it has displaced, not more. In other words, it can only go as far back in time as when it originally began displacing. Anyone with this phonebooth can travel back and forth, but they can never travel farther back than when they first started.

As for the paradox, there is no way of getting around it. Even if you could somehow create negative displacement, there is simply no way around the fact that traveling one second back in time is travelling one second before you began moving, ergo you haven't gone back in time yet. As somebody mentioned, you might be able to travel backwards in a different timeline, however we are barely at the stage at which we can theorize about there existance, let alone the properties they might have, so anything said about alternate timelines will be pure speculation.

I have similar problem... In Slovak I can explain stuff ten more better. But I sacrifice my argue skills to variety of people discussing the theme.

There should be no real reason you can't travel to the past but don't expect to change anything. It's the past which means you've already been there, anything you're going to do you've already done. That's why it's the past.

If i remember correctly, going faster then the speed of liight will make you go back in time? either that, or go forward...any whom yes i belive that it i possible to go back, or forth (whichever it is) but the hard part is getting back!
remembering my studies, there is a way to travel through time very simply...
take two watches with identicle time and leave one at home, and take one wiht you on an airplane, when you get home, they will show different times! its amazng the connections between speed and time

Paradoxes aren't allowed to happen. Nature (and when I say nature I am talking about the nature of existance) prevents such events from happening.

Oh, and why does everyone still think time travel is possible? If I were to step from one time to another it would break the law of conservation of mass and the law of conservation of energy. There is one constant amount of energy and mass throughout the universe and if I were to take some mass from one time and transplant it to another it breaks these laws. Breaking the laws of physics is a feat I only think God is capable of doing.

BTW, this might sound a little crazy but it is an idea I think would be great in a science fiction plot or something of the like:
A chrononaut travels to the past to kill himself as a child but as he pulls the trigger and the bullet is released, all of nature (the nature of existance) struggles to stop the bullet. After all nature, as I have said, cannot allow a paradox.

Anyways, if I thikn time is set up as film of a movie. There are set courses for our consciences to travel though but I think going backwards or faster than normal is imposible. I think some other philosopher has already come to this conclusion, but I have forgotten his name. I think the only thing keeping these constant speed of travel of our consciences are the laws of conservation of mass and energy, like I said above.

Well that's my two cents on time.

If you could travel into the future and back. Then what would happen if you tried to bring someone back... your present would be their past.

If time travel was possible, I don't think anything you did would affect you. I think it would be another timeline or something.

If you go at the speed of light (I don't know enough about physcics to knwo if faster is possible) you go into the future.

There was some ratio I remember learning, but can't be precise on the details of, something like going the speed of light for a year equals thousands of earth years.

I believe in it completely...but, in a different way. You see, I dont think that TIME is exactly..."real" I'll explain...ok, u see....we measure time in numbers. Correct? But in truth, what happened two seconds ago, is history...or so they say. But to me, I think that there are things called, "time slots" meaning that what happened in the past, is still going on, and we are just in what we would call "present" but of course, since an is becomes a was rather quickly, we basically live in a contium of time slots, opening and closing. Its like this...if we can somehow reopen a time slot, we could go to the so called, "past". Its not that we can't...we can. (I will not reveal any more information...) Its just a matter of everyone figuring out "how." And of course, since the mind is so powerful...well...theres your answer. I must be going now. C u all later!

I'm one to think that even travelling into the future would be pretty impossible. I mean firstly, you need a vessel that goes at the speed of light, and as far as I know there hasn't been one yet. Also if you did manage to travel at the speed of light the drag (air friction) would probably cause the craft to spontaneously combust. Although we are travelling into the future at this very second if you think about it...
As for travelling to the past, it could be the same sort of thing, only reversed??

Keep in mind: there was a report that a Project Mercury or Project Pegasus was peformed using children in teleporation experiments between Woodridge, NJ and Los Alamos, NM back in 1970. The sad part is they treated the kids like guinea pigs, never caring about the long-lasting after effects like skin problems from the quantum field effect. Basically the kids were jumping through this large set of curved armatures ( ) from both sides of the armatures. Although people would appear to be running into each other, they'd end up in a Woodridge or Los Alamos. The neat part was the kids got teleported forward in time because the kids were teleported in 1970; but the hotel they met at in Los Alamos wasn't built until 1973! And naturally the kids were quantum-slingshotted into the poorest neighborhoods, so no one would ever believe you if a kid just materializes in front of you.

And Donald Rumsfeld was there in those Project Pegasus experiments in 1970, doing meet and greets, but he won't admit it.

They haven't told you everything that went on in Los Alamos, NM. All of the stuff on the net about Los Alamos isn't the full story. Quantum Field Effects are real, and teleportation is possible. Why can't people who know this stuff just confess it for once? There's all kinds of technology held back from us, like number folding (compressing a million bytes into 1024, using polylogarithmic exponents). Where's the programmer who can write a program that takes your whole hard drive and thinks of it as a huge number... and then converts that number into a large exponent, like 9^848474323.37638276...? You never ever see that number folding program because the military likes hoarding these golden eggs. Trust me, I saw this program run myself. It runs like a disk defragmenting program...

Where are the people who know about this stuff? And why are they willing to die to prevent us from knowing more?

why doesnt he kill himself in the present?

This is a interesting subject.
I like ya'lls theories, and opinions.

I think that it is possible to go into the future and thus making it possible to go into the past.
But if we DID go into the fiuture, we would come back to the Past (err, present) and try to change it, cause we already know whats in the future.
But then if you changed anything in the present, (cause you saw the future) it would make the future, all fake. or nonexcistent.

there IS no future, because wihtout a past there is no present, the present is happening now, so if you saw the "future" and tried changing the present, then the future wouldn;t be like it was suppose to be. bringin you back into the present.

The future would be Now, and only now, and the past is what you can have record for. Say I went to the future and saw myself falling off stairs... (simple)
then I go to the present, and make sure there will be no way that I can fall off stairs, I would avoid even going on stairs.. and that means that, if I did got to the point where I saw the stairs incident, and avoided it.. say it worked out. then the future wouldn;t be true. the future wouldn;t be POSSIBLE, because in the futre I avoided stairs... so i think there's really no future. there are just past and present. Because the futre dosen't/wouldn;t be until the present is presented.