Is time travel possible?
823216
Yes!\n\nWell, in theory, at least.\n\nThe "Time Machine" would require the existence of a worm hole - something that scientists believe may exist in theory. Sadly, of course, we haven't actually found one yet, so this is all pie-in-the-sky, but if we *did* find a worm hole, then it's dead easy! (Sort of.)\n\nHere's how we do it.....\n\nFirst, find your worm hole.\n\nSecond, drag one end of the worm hole across space until it is next to the other end.\n\nThird, drag the end of the worm hole round and round the other end, at a speed as close to the speed of light as you can.\n\nNow, as we all know (don't we?) time travels more slowly for a moving clock. (Actually, this has been proved to be true, but that's something for another question - ask and I'll tell you how they proved it.) So, since time is travelling more slowly for the end of the worm hole that you're dragging around it will slip into the past relative to the end that isn't moving.\n\nLastly, simply jump in the end that you've been dragging around and you'll appear out the other end in the future. Then do it again and appear even further in the future. Repeat until you are as far into the future as you want to be.\n\nOnce you've got bored with the future (as if!) just go around the other way and you'll go back in time until you arrive back at the time you started.\n\nYou can't use it to go back into the past though, because you'll simply return to a time before you made your time machine i.e. before you dragged the other end across space.\n\nSee? It's easy! LOL
1065560
Anything is possible "if" another impossible thing is found to be possible; so long as the original thing is made possible by the formerly impossible thing.\n\nIn other words, of course time travel is possible so long as other impossible things become possible that would make it possible, such as your catalyst which would open a space and time rift.\n\nTherefore, the real question is not whether time travel is possible, but whether any catalyst does exist that would make it possible.\n\nThanks for the post!
258081
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.
590908
Without going into detail I don't claim to understand, I have read that time travel to the past is theoretically possible, but not with today's technology, so yes, I allow for the possiblity. Many of yesterday's theories are now today's scientific facts.\n\nFurthermore, UFO means "unidentified" flying object. Every year, there is a small fraction of aerial phenomena which cannot be identified or explained - making them "unidentified". These occurrences may not be inhabited extre-terrestrial spacecraft (or they may), but to say there are no "UFOs" is fallacious.
1186293
I think i read on here somewhare that Albert Einstien said that time travel was impossible but time seeing was a possibility.
68516
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.
813626
Sadly, I've actually heard about this before.  I can't believe how much useless junk I put into my head...I'd say pure fiction.  Its just more likely that he was some bored computer geek trying to get some attention.  Its still unclear whether or not time travel into the past is possible.  Based on current science I'm leaning toward the impossible side.  Oh well, 2036 will be here soon enough.  Then we'll know for sure.   ;)
945559
Relativistic time travel is possible. Time passes more slowly for an observer who is in motion relative to one that is at rest. The next trick is to define which is which, which is why Einstein won the Nobel Prize (although it actually wasn't for relativity, but that's another question).
290592
*Edit*\nSorry for editing again!\nTo answer your questions. Yes the past still exists! But objects in the past have a fixed (p,q,r,s,u,v,w,x,y,z,t) location (where each letter represents another dimension in space, t = time). To realise this, think about where you were last Friday at exactly 4:00pm. You're position at that time will never change again. Wherever you were, that's where you'll always have been last Friday at 4:00pm. The rest of this post explains why you cannot go back to that time without dramatic changes in your string physiology, but that time travel may be possible for some types of matter (possibly supersymmetric matter?). Unless matter has moved backward along the time dimension, it cannot move forward, because the time dimension is expanding along with the rest of the universe.\n\nI had this discussion on a drive up to play hockey in Edmonton the other day. Here's my idea but I don't know if it is true:\n\nYes, time travel is possible. Time is just like the three other open dimensions we are used to - you can travel back and forth along the 3 space dimensions and it is possible that things (notice I don't say people, keep reading to find out why) can move back along time. But as far as I know, the four dimensions of space and time do not have radii like the 5-11 compactified dimensions of M-Theory do. Therefore something travelling in time cannot loop back to the same place in time that it was before. Thus you could not go back in time and have yourself arrive at the same place in spacetime that you are today. The dimension is linear.\n\nThe MOST important part of this is the idea of symmetry breaking. In my mind, symmetry breaking accounts for why something traveling back along the time dimension will not encounter the same events that originally occurred when it started it's motion along time. Symmetry breaking is a time dependent event. The easiest way to explain it is to reference the poem "The Road Not Taken" by Robert Frost. Events in time diverge at critical points (usually at critical values for state variables like temperature). Travelling back in time would cause disorder of various aspects of energy and matter in the universe, and different bifurcation paths, or "decisions", might occur, effectively changing the future in ways imperceptible to things that are made up of baryonic matter, which leads me to my final point.\n\nThe only objects that could time travel are those made up of closed, unattached strings. The strings of ordinary matter, like that which we are made up with, are open ended and attached to dimensions. This is why the mass that makes up us and objects like the sun distort spacetime. Time actually travels slower as you approach mass, and this is what causes masses to move toward each other. Time gets warped and masses fall towards spacetime that is in a lower transient state. What makes us up is effectively 'attached' to time, so unless we could change ourselves to be made up of matter of closed loop strings, we cannot attach ourselves from time. This also means we cannot leave our universe either, but that's another story.
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.
519456
There are some strange solutions to Einsteins field equations which some theorists claim to offer the possibilty to travel backwards in time but these are pure hypothesis.\n\nFor one of these possibilties you would need a huge amount of "strange matter" which we yet even don't know what it is exactly, other of these hyothesis would allow to travel back in time, but not past the invetion of the thime machine, since this time machine is the "exit" on the other side of the "time tunnel".\n\nOther scientists say it will never be possible, for varios reasons, one of the most mentioned is the problem with causality (althogh there are again theories that that would't be a problem) another very funny one is by Stephen Hawking: There never will be time machines, becaus if it would we would see tourists from the future all the time.\n\nSo, seriuosly, don't expect to see a working time machine during your lifetime.
1082095
Time travel to the future is theoretically possible.  Travel in space at near-light speed for a short time and a much longer period of time will have passed on Earth.  Or you could have yourself cryogenicly frozen (though I'd wait until they perfect the revival process) and see the future that way.\n\nIt would be a good thing to see the progress of mankind, but you may have a hard time fitting in.  Since there's no way to travel backwards in time, you would be stuck there.
1084779
According to some scientists, if you can get faster than the speed of light, you can cross time barriers by bending and manipulating the space-time continuum.  Also, some quantum physicists believe that the universe and all of existence is made up of separate, infinite numbers of dimensions, so time travel without going faster than the speed of light would essentially be traveling to a different dimension in a different time that is not too different from the history of our world.  That's pretty far-fetched, though.  However, I still believe in the possibility.  Nothing's impossible (almost).
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.
1139606
Im afraid I do not think time travel is possible.  Einstein’s theory says that as you move faster time slows down.  The problem lies in getting to a speed that is so fast that time actually moves backwards.  Anything with mass cannot reach the speed of light, because as its speed increases the amount for energy required to push it increases, so it would take an infinite amount of energy for something with mass to reach the speed of light.  Photons have a zero-mass and therefore light can travel at... well the speed of light :)\n\nSo if it was possible to break ourselves down into zero-mass pieces then it would be possible to travel the speed of light.  What is unknown is if you could travel so fast that you could actually "turn back time" which I do not believe is possible.  Or else we would see people from the future already coming back to the past.\n\nAnd then you would get those crazy little problems of ... if you went back in time and killed yourself at say 12 years old.   How would you have ever been old enough to actually travel back in time to kill yourself... because you would have been dead...\n\nIt could be possible to slow time down in relationship to yourself, so that the earth ages faster... If you consider that time travel.  Say for example you get into your space ship, and travel near the speed of light, then the earth would age faster relative to you.  If you consider that time travel then yes I believe that is possible.  But the thought of going forward, and back in time is not possible in my humble opinion.
124898
Yes and no, Time travel is almost certainly not posiible and at the same time might be. It is believed that going faster than the speed of light would allow you to go back through time, but this is supposed to be impossible, but hawking radiation does it every second as it escapes black holes so it must be possible. Although if it does go back in time wouldn't it just go back to the time when it was in the black hole and not be observable to us. So maybe.\n\nAlso their is the Granfather paradox, which says that if you go back in time and kill your grandfather, then you never could exist and go back and kill your grandfather, so you can't, but then you never killed your granfather, so you do exist and kill your grandfather, so you don't exist and can't, it goes on for as long as you want to think about it. So their is another theory to bypass that one, it says that if you leave this exact point in time, you enter another universe altogether, one that you can change without consequence, making it possible to kill your grandfather, but als killing the reality of the universe you came from. Interesting huh?
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...