Do you think that time travel will ever be executed or that it already has?

Answer 1

No, or at least, not right now. There are a number of difficult hurdles to overcome. First, the main problem is one of energy. In the same way that a car needs gasoline, a time machine needs to have fabulous amounts of energy. One either has to harness the power of a star, or to find something called “exotic” matter (which falls up, rather than down) or find a source of negative energy. (Physicists once thought that negative energy was impossible. But tiny amounts of negative energy have been experimentally verified for something called the Casimir effect, i.e. the energy created by two parallel plates.) All of these are exceedingly difficult to obtain in large quantities, at least for several more centuries! Then there is the problem of stability. Kerr’s rotating black hole, for example, may be unstable if one falls through it. Similarly, quantum effects may build up and destroy the wormhole before you enter it. Unfortunately, our mathematics is not powerful enough to answer the question of stability because you need a “theory of everything” which combines both quantum forces and gravity. At present, superstring theory is the leading candidate for such a theory. (Actually, it is the ONLY candidate; it really has no rivals at all.) But superstring theory, which happens to be my specialty, is still too difficult to solve completely. The theory is well-defined, but no one on earth is smart enough to solve it.



Interestingly enough, Stephen Hawking once opposed the idea of time travel. He even claimed he had “empirical” evidence against it. If time travel existed, he said, then we would have been visited by tourists from the future. Yet we see no tourists from the future. Ergo: time travel is not possible.

Because of the enormous amount of work done by theoretical physicists within the last five years or so, Hawking has since changed his mind, and now believes that time travel is possible (although not necessarily practical). Furthermore, perhaps we are simply not very interesting to these tourists from the future. Anyone who can harness the power of a star would consider us to be very primitive. Imagine your friends coming across an ant hill. Would they bend down to the ants and give them trinkets, books, medicine, and power? Or would some of your friends have the strange urge to step on a few of them?

In conclusion, don’t turn someone away who knocks at your door one day and claims to be your future great-great-great-granddaughter. She may be right.

Answer 2

Yes time travel has been executed:

You can travel from Japan across the Pacific Ocean and reach USA at an earlier time ie. It is possible to start ur journey today in Japan and land yesterday in USA.. But you have to understand that this is only the "worldly" time that ur beating because of spinning of the earth..

However, it is not possible to go to the past and relive the experiences.. you can merely go to a different timezone in the earth..

Answer 3

Below is an answer I submitted to the question "Is time travel possible"? In addition to this, Time, Size, and Mass will all seem normal for those in their own reference frame. These entities would seem peculiar, for example, if earthlings could somehow see the people travelingclose to the speed of light. The Earthlings would see the travelers shrink, become more massive, and notice that their clocks were running significantly slower. The foollowing is a a brief descrition of time , the 4th dimension. I hope this helps.

Yes, one aspect of time travel is theoretically possible. That is to say, according to Einstein's Special theory of relativity it is possible to travel into the future. How far in the future in a given time span depends how close to the speed of light you accelerate. Traveling at 80% of the speed of light according to Einstein's formula y=1/ Sqrt 1-v^2/c^2 ,(v=velocity, c= speed of light) the clocks on Earth will advance 1.667 times faster than the one traveling in space. Therefore, after a twenty year journey by the space travelers, (20 yrs time has elapsed by the travelers account) upon their return, there will have passed on earth 33.4 years.
At 98% of the speed of light, 20 years of travel at this speed, upon return, 100.4 years will have passed on earth.
This is the equivalent to traveling into the future, which is a form of time travel. Therefore time travel is theoretically possible. In fact, check out this site as the guy proclaims that we will be able to approach speed of light travel within 100 yrs.
http://www.physorg.com/news10789.html......
Traveling back in time is debatable, as you would have to be able to exceed the speed of light to do that.
Plug in the numbers to this formula. speed of light c= 186,000 miles per second. For velocity, just multiply this number from .01 to .9999. Then just follow mathematical operations.
good luck

Source(s):

http://www.physorg.com/news10789.html......

Answer 4

Look, as I told you next week, we are not suppose to talk about that!

Seriously, to travel forward in time at an accelerated rate is possible using cryogenics, relativictic velociteies, however, to travel back again is not something I see happening.

Answer 5

well no one in the future ever came back to tell us that it was accomplished. but then the future hasnt happened yet for them to do it so maybe they will tomorrow and then come back and tell us yesterday, but then wouldnt we already know? well, you see the problem.
we do all travel foward through time and at different rates relative to each other but backward, not so much.

Answer 6

damn, good question. special relativity allows "time travel" of a sort into the future by traveling near the speed of light, but as for time travel into the past, whi knows?

Answer 7

If it had been there would be time travelers in every possible era.
I would have been spreading it like the plague myself!

Answer 8

Yes, in fact it has already been achieved for single atoms.

Answer 9

nope