If time machine can be created in future, how is it that no one has come to our time from the future till now?
155617
How do you know they haven't?
186287
Under Einstein's General and special theories of relativity, time travel is considered possible. Stephen Hawking has speculated that it must not have been discovered to be practical as we have not seen tourists coming from the future to visit us.
1042619
Well, it is a fantastic concept! Also, even if this could happen, it would take billions, if not billions of years!\nAnother way is that who and why do we accept the time direction as we do now? Because it fits, us! Well, sometimes this concept is reversed! SO, time could go the other way or go faster or slower, but this only in certain moments, yet!
433550
Well, time really doesn't exist. It's a human invention. We define time as what it is because our minds can't fully comprehend the fact that the universe is one big giant now. So nothing begins, or goes away, because everything happens at the same time. We choose to say it happens at different times, but it really happens in different places, on different planes of existence.
39192
Time travel is to travel to any point in the past or future. Ideas of time travel have existed for centuries, but when Albert Einstein released his theory of special relativity, he laid the foundation for the theoretical possibility of time travel. As we all know, no one has successfully demonstrated time travel, but no one has been able to rule it out either. It turns out that, in some sense, we are all time travelers. As you sit at your desk, doing nothing more than clicking your mouse, time is traveling around you. The future is constantly being transformed into the past with the present only lasting for a fleeting moment. Everything that you are doing right now is quickly moving into the past, which means we continue to move through time. To learn about the concept of time and the different theories surrounding the viability of time travel, you can visit this site: http://www.howstuffworks.com/time-travel.htm
630252
Teleportation. We at least have theory on how teleportation could work. If the universe under discussion permits of time machines, then no time machines will be invented. The noted s/f author Larry Niven wrote a couple excellent essays on these topics, which I recommend to your attention. They will provide all the information you could possibly need.
1005165
By changing the present (or past) it doesn't necessarily change the outcome in the future.  Watch or read "The Time Machine" by HG Wells and that will explain it more.  I would suggest reading it.\n\nSome things are just inevitable and will occur regardless of how we act or react to situations at any time.\n\nI read that you remembered in T2 the hand and chip were saved.  As they studied these items, things could start to be set in motion by the machines that may occur in the future.  Now, assume that we run out of fossil fuels and the sun dims, but life still exists.  Without electricity or fuel that doesn't mean that we won't have the technology to go to war or destroy ourselves.\n\nI guess that's why in showbiz they call it creative licensing.  They can leave any door open to make more.
164691
According to Einstein, it's only possible to travel time to the future, although he never said that going back in time is impossible.\nTime slows down for you and your vechicle as you travel close to the speed of light (186,000 miles per second).  Anything outside is at normal time and speed obviously.\n\nTheoretically, if you travel 30 mins out into space at the speed of light and travel back to earth, you're only an hour old (by the way, at that speed, you've traveled an equivalent of six of our solor systems).  However, as you return to earth get ready to meet your great great grandson.\n***\nI don't know why.\nIf I did I'd own this freaking corporation.  *L*
1105020
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.
920732
No because, while time may pass at different rates for different people, they are all still "in the present."  You don't have one person in the past and one in the future.
381508
Think about what time traveling to the past means. It means that the entire universe except the time traveler is in a previous state. Now, for the time traveler, his time is still moving forward. He is older in the past after his journey than he was before his journey. \n\nSo, you have an entire universe one way and our traveler another. Since there was no past that existed that had his time traveler self in it, where has he gone? What is more reasonable is a time traveler experiment you can do yourself  by sending a smaller part of the universe into the past and watching that as you move foreward. Sound weird? Well, you can do it by resetting your computer. It goes into a past state and you keep moving foreward. This sort of time travel sounds like a cop out but it is just what is generally described on a smaller scale. That is, the entire universe but the traveler gets re-set to a previous condition.\n\nI know this answer doesn't satisfy the mystery feeling one gets with the time traveling notion, but it's what we really mean.
1061597
That is a scary thought, just one wrong person or even one wrong move and the world could be thrown into a parallel time or alternate universe, but would someone with a time machine be able to fix what went wrong. Then I think of what good even I could or what  I would want to go back and "fix" warn myself or loved ones of mistakes, prevent some deaths, but I know that this is not my place and I would not want to "play" God, Greed would probably play into it and I would want to play the lottery or something equally greedy. Great Question!!! Thanks for getting me to think about this.
68159
it is not that confusing. About three year ago on PBS there was a program that talked about time travel and one of the scientist stated that even if we could travel back in time we coul donly travel up to the point when the time machine was invented.\nBut do not forget there are manyh theories about time travel. For instance the grandfather paradox claims that you could not travel back in time, but others say you can but in a different dimension.
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.
893783
Time is always now, now, now. We only really are certain about the present; our memory & evidence of the past, and our ;assumptions about the future. The past and future dont really exist, because they  dont exist now. The past used to exist, but doesnt exists now except what we know about it. The future will exist but doesnt exist now and so we don't experience it. \n\nTime continues on at a steady pace all the time as far as we know. There are theories that time has relation to other things, that time is affected as you approach the speed of light, but we haven't fully explored this theory. \n\nTime exists as more then that but only as a concept. We have words for many things that don't exist or that exist only as concepts.
676857
Assuming time travel is possible, I think such a senario might be possible.  The trouble people have with time paradox lies in the assumption that every thing in the universe shares the same time line.  Why should that be true?  Here's an example:\n\n\n------  X  -------------------  Y  ---------\n\nAbove is our theoretical timeline.  Y represents me, in the "present".  I use my time machine to go back to X, before my grandfather sires my father, and kill him.  Logic dictates that I shouldn't exist.  What I'm suggesting looks like this, instead:\n\n---------------------------  Y  ------------\n                             \n\n---------------------------  X  ------------\n\nX & Y still represent me & my grandfather, but each of us now possess our own separate time line.  Instead of "going back in time", I simply hop off my timeline & onto his.  I am now free to perform my assassination, without consequence to me (beyond the obvious legal ones), as I was not born on this timeline, but my own.  Whether or not I can now return to my own timeline is an entirely different question, however.
460815
It already happened in the future which was erased when they went into the past to show it off which resulted in the machine never existing which negated the previous invetion but led to a second much sooner invention of the time machine which, of course, already happened in the future at which point...