I begin with this article.

http://www.youtube.com/watch?v=AECmzuzJoKo

You can travel into a future just by moving with some relative speed (close to c) a while, but you can't come back.

Actually you travel into future per definition as the time axis is always positive (time goes by anyway) even if you don't even move ;)

But actual time travel is out of Limit as far as we know at the Moment.

Kimmo, not so.

Lest we forget - and this is a blast from the past:

http://theophysics.host56.com/pdf/tipler-rotating-cylinders.pdf

The theoretical underpinnings are sound.

One just (ha!) needs some arbitrarily dense material and enough willpower - closed time-like paths are possible in *both* directions.

Allegedly.

@Johannes You are absolutely right :D Let's say, that in principle, we can travel into a future as understood in sci-fi.

@James I have a better theory (ToEbi) than GR so I don't buy any other time traveling possibilities than going into a future.

Kimmo,

A theory makes testable predictions.

To the best of my knowledge GR has a long history of tested predictions (gravitational time dilation, frame dragging, etc.)

If you have a theory, rather than a hypothesis, may I ask what predictions you have had confirmed by experiment that are in violation of GR?

@James None, my theory is TOE, it includes QM & GR. However, my theory resolves for example twin paradox.

Dear Ana,

We watch time travel in TV, and there was a company founded in 1993, providing travel and tours management and serving customers over a period of two decades. I hope this will come to reality

Kimmo,

My understanding of the Twins 'paradox' is that it is *not* a paradox - the twins have histories that are not identical - one does not accelerate, one does. They are not and cannot be construed as being the same.

I recall (it's 20+ years now) that French's 'Special Relativity' dealt with this rather well and had an integral approach to calculate the time difference.

Does this still need to be 'resolved'?

@James Yep, that acceleration is a true safe haven SP :-)

Subjetive time

http://www.youtube.com/watch?v=RjlpamhrId8

Possible

http://www.youtube.com/watch?v=AX-wueNuvLM

I am looking for the experiment inside the electromagnetic tunnel a few years ago, but I don't found.

Dear Ana,

Thank you for the link in the original question. I think Paul Davies already explained that, to travel back in time, one needs to do impossible or impractical (for now) things like finding a wormhole and putting a neutron star just next to it, reaching a blackhole, or developing a small spacecraft moving close to c. With that, back-time travel may or may not work; and if it works; there are the paradoxes he mentioned.

However, Eric W. Davis, made an 80 pages-report on 2004 for the (American) Air Force Research Laboratory (AFMC) about teleportation in physics

https://www.fas.org/sgp/eprint/teleport.pdf

and in this report (almost a long review) you will find there are some military interests in these techniques. So maybe it is a good thing no one could develop it yet, because it might bring chaos to this world -and it might bring very useful things too, but I think we will never know until we have it.

The funny thing about the video is multiplying onself -or better, multiplying money, which everyone wants to have. But again, is there a bank that takes 1 million dollars and all of them with the same serial numbers? So, even multiplying money cannot be useful....

Regards.

Travel in time is most often associated with the possibility of displacement of an object from the present to the past or the future. However, each object is part of a larger whole and results in a concrete way from it. Atoms created the structure of our bodies as a result of prior actions . This what we have today results from what it was yesterday. And it is inseparably linked causally . Even if we could draw back the event with some incredible effort, we should also simultaneously destroy ourselves. Otherwise, it would not be the same situation , and therefore we couldn’t say that there has been a withdrawal in time. Personally, I can’t imagine a way to change the direction of such action. Yet, each elementary particle would have to return to the position of the proper time, after “its own steps". This means reversing the direction of the entire universe. After all, every element is causally related in the area of billions of light years.

We can chase the image of the past using some hole in space, but even if so, it's just a picture that we can look at it at most . As to the future instead we can only anticipate it. Nevertheless, if we have mastered the art of the reversal processes in our bodies , we could live indefinitely . Of course, not longer than the universe . But this is not a travel in time.

Ahmed, thank you very much for the report.

Dreaming is the source of Scientific Inventions and innovations... Time and Travel are the contents that affect the imagination of Mankind to fantasies and fallacies...

I don't know whether it would be possible in 21st century to time travel.. nothing is impossible to happen

I remember that I watched movie "Time Machine" years ago. It was a fascinating idea and fiction as well. Let us hope that one day if not we then our children or grand children or their grand children would be able to travel through time. Till then, let us travel through time by our imagination.

I am the first to write a definitive report for select members of the U.S. Congress and in doing so I had to solve all of the major issues concerning time travel, from Kurt Godel's questions about the past to proving that time travel paradoxes are scientifically impossible. The report is now available as a book with extra material included - http://www.blurb.com/b/5622324-paradox-lost-the-public-edition

The dream of traveling to the past or future has been with us since the beginning of our existence. A BRIEF HISTORY OF TIME TRAVEL explores the history and connection between time travel and humanity and how this idea has influenced some of the most prominent thinkers and creators in the 21st century.

http://timetraveldocumentary.com/

Hi Marshall, its been a while since our last talk. Your work has done its way to my mind and since then on, I can't stop thinking about it. I would like to say that I like your idea of a sheath that acts like a kind of lubricant to drill a hole in spacetime to make the ship passing through with that sheath that protects the ship inside it. It looks much like those UFOs who are supposed to be equipped with some kind of those warp drives and that we see on youtube. Pretty often, we can only observe a dot of light, just like if the ship was covered with this same kind of energy-plasma sheath/field you're talking about. We can often also see those ufos disapearing in a flash of light, as if we were seeing the intensity of the field/sheath increasing along the brightness to the point it seize a nano worm-hole, enlarge it up to the macroscopic scale and get trought then the brightness is blowing out as the ship  is disapearing inside the hole drilled by that STDTS generated sheath that closes in right after.  So what's your opinion about similarities between both phenomenon (Ufo's and your Verdrehung fan) ?

By the way, I just bought your book from Blurb, can't wait to get it and talk about it with you Marshall !

Yannick,

I haven't been here for a while as I've been extremely busy. Thanks for buying the book. I hope you enjoy it!

To answer your question, there's no real connection between UFOs and the Verdrehung Fan. One is allegedly a flying craft and the other a stationary, wormhole manipulation device. The STDTS field deployed in a linear fashion doesn't drill holes in space-time, it contracts space as it moves through it. 

I hope that helps...

Marshall, very happy to have some news from you !  I read your book entirely in a weekend. As I have already read a lot about your work, the content of your book was familiar to me indeed. Now I understand more how you see things. I think that in fact, geometry has a lot to do in the vision of what spacetime really is. I can see a clear link between the parallel geometry of time and the teleparallelism theory you've been inspired by.  What remains a mystery to me is how your STDTS signal is generated and how it acts on spacetime to perform what you say it does when you tell it contracts space and eventually time as it moves through it. In other words, how an electromagnetogravitic signal can be generated and how come you came to the conclusion that it can open up nano-wormholes. Did you really test all other explanations why your radio or IR remote control signal  disappears through the Verdrehung fan ? What I need to see is a proof of concept like the ones your planning to do with a gravity drop presentation or the launch of a pico satellite. So all I have to do is wait and see I suppose !  By the way, I read somewhere that you were actually working on the issue about how to control the destination point in space-time, do you have some breakthrough discoveries to announce us soon !?!

Yannick:

I'm glas you liked the book. The STDTS signal is the result of looking at electromagnetic theory a completely different way. Where as H. David Froning believes that electromagnetism can produce gravitic effects if it is properly conditioned, my approach was to experiment with the content of the field before it is produced. I can't say anymore about that because I am not a scientist but a R&D engineer. In other words, my purpose is not to make great discoveries to share with the world but make great discoveries that can have a commercial benefit. As a result, all research into how to create STDTS fields and the like is proprietary and trade secret. It this point, its value has gone from in the billions to priceless. 

As for its effect on space-time, it does things that have no other explanation. This has been proven over and over again since 2000. As for opening wormholes, there are other scientists working on the theory of the ability of micro wormholes staying open long enough to send light through, such as Luke Butcher of Cambridge University. However, my research into the effect of torsion physics being applied to quantum foam, the way that the Verdrehung Fan does, results in exactly the identical predictions that my experiments show which exceeds what Butcher thought was possible and my research was presented before Butcher ever published.

As for proof of concept, it will be in the documentary, The Dawning of the Age of Time Machines, which is in production right now. As for selecting the destination, as you put it, I am prepared to begin those experiments, probably next weekend. It will be filmed as part of the documentary. The real problem at this point is figuring out realistically, how to even detect any opening anywhere because the openings we're getting now are so small.    

Tell me when do you expect to finish the footage of your documentary ? Also It would be fine to have some news about the outcome of your experimentations on the destination issue. Meanwhile, thought a little about the idea of the holographic universe principle, like a 2Dimensions (lenght+width/height) storage unit that stockpile information(energy-matter) into a third dimension of time/depth. So the elementary particles are maybe becoming infinite parallel timeline strings in this way by gaining depth/time according to Everett-Wheeler hypothesis and to the holographic principle with the idea of a universe that contains all possibilites of choices and parallel futur outcomes. This river of space-time into which we're going through at a relativistic speed has a certain density of information that merely acts like as current or a kind of resistance (ref. fluids mechanicals and thermodynamics). So if you intend to really travel faster than the permitted limit of 300000km/sec. to go back or further in time/depth, I think you've found some kind of a bubble machine to dilate space-time, just like high divers that plunges into a pool filled with air-bubbled water to ease(to DILATE water's density) the passage between two zones of different density. Is the analogy right according to you Marshall, like if flat water is the normal spacetime with a speedlight limit of 300000km/s, and to inject a beam of air from the front of the "vehicle/spaceship" into water is the mean to go through hyperspace-time(in a forward of backward FTL movement into the depth-time dimension) ??? And I thought about another thing. About the fact you are a musician and you know that the physics of music reaches the optical physics in some ways, like phonons are to the photons. SO, my intuition is that you created your STDTS signal inspired by your knowledge of sound modulations, harmonics, vibratory frequencies, etc. to generate an electromagnetic field of some vibrational frequency that disperses or dilate the quantum foam boiling and create a kind of Einstein-Rosen brigde-highway to hyperspace, just as the air-bubble machine does it into a pool for high divers to travel faster into water with less constraint. Now I think I am near to reach the truth right ? Sure it's pretty imaged with analogies, but isn't it the Einstein's best way to solve abstract problems ?!?

London:

The Anderson Institute, as well as David Anderson himself, are not legit. Also Anderson, as far as I know, has not claimed to have done time travel to the past, but caused time dilation. As for a Andrew Basiago, he's a fraud. He has made a number of public statements which can be proved to be false. It's interesting that both David and Andrew have publicly called for government control of time travel technology which would restrict the very research that they promote. 

If you seriously want to learn about time travel physics I suggest you check out my book, only because it is the only source available that solves and or answers 100% of the issues, questions and speculation about time travel. The book is called, Paradox Lost:The True Geometries of Time Travel - The Public Edition and is based on the special report I created for select members of the U.S. Congress, the first report of its kind. You find it exclusively at Blurb.com.

London:

I've been studying the potentials for time travel now since the early 90s. I have covered both the fringe areas, the frontier science areas as well as the most cutting edge  of mainstream theoretical physics. I dare say I'm the best in the biz. Unfortunately, you have fallen into the material of David Anderson and Andrew Basiago which I can prove to be fraudulent material. You will find no useful "networks with time travel technology through" them. 

For example, if you have studied time travel physics as deeply as you claim,  then you should be able to describe the issue caused by a Cauchy horizon which must be addressed for the most common form of time travel to take place which I'm sure you must have learned from their research, or why paradoxes are scientifically impossible or why the massive energy requirements to warp space-time as predicted by general relativity are not required. If you been studying very deeply on the subject, you should be able to answer at least two of these questions.

As for what my book does or doesn't prove, the description is self-explanatory. The bottom line is that I have interviews that David Anderson has given which prove what a fraud he is and the only reason I don't expose Andrew Basiago is that he hasn't claimed that I was involved in any of his ridiculous time travel fantasies as he has Ed Dames, formerly of the DIA or President Obama. Rest assured, the minute he does I will run him through a public meat grinder that will leave nothing of him left. I have little patience for people who deliberately mislead others, especially when I can prove that's what they're doing, because they make victims of people like you.

As for resources for you to time travel, I don't know of anyone doing that yet, at least not legitimately. Although I'm a leader in that research, we are not at the level of sending anything more than RF and IR waves anywhere...

London, neither one of them has proved anything. Both have made scientifically inaccurate statements that prove that they're B.S. Anderson, himself has NEVER claimed time travel but time manipulation, a sort of time dilation which is not time travel.  That probably wasn't true as he's never presented any evidence of it. Basiago has made statements that prove he knows nothing about time travel physics beyond the most pedestrian level. 

I don't give a damn who knows who or who you say said what. You can't provide me with anything that you've gotten from them that will stand-up to my scrutiny or you would have done so by now. You haven't even answered the questions I posted to you in my last missive. I've spent over 20 years in this study and I knew about both of these clowns before you even knew who they were. Anderson has never shown any demonstration or even photos of any of his equipment. Basiago has used phony sources and none evidentiary materials as alleged proof. If he ever claims that I ever had anything to do with his nonsense, the way he has with others, I'll legally destroy him from the face of the Earth (which is why he hasn't yet, I'm betting).

Don't waste my time with this garbage anymore. It's indefensible, and I've stated as much, and I frankly don't care if you believe it or not. I'll talk about real physics in the area of time travel but not total rubbish from frauds and psychologically driven B.S. artists.

 London:

Fine. You get me booked to do the lecture presentation, Time Travel: The Physics, The Facts and The Frauds, at Stoney Brook and I will prove everything I've said or give-up my speaker's fee (note not travel costs), that's how much I know about what I'm talking about on the subject as well as these frauds who've got you duped.

@Theophanes

"If you really have a "warp" fan why don't you talk to "Sonny" White from NASA that still tries to bring about something similar?"

I met Sonny when I spoke at the 2013 100 Year Starship, ironically after I defended him against accusations from Miguel Alcubierre. He told me then that "We're nowhere close" as far as doing anything with warp drive. Just last May, NASA had to announce formally that they aren't developing a warp drive. 

"They would probably be more than happy to fund this kind of stuff. "

I began stating publicly that I had no interest in working with NASA or any other government agency because I don't want the red tape and bureaucracy and I don't need their money. This is a 100% private sector operation with investors and a business plan that is already being worked. I stand to make a lot of money from this all, beginning next year with a ceiling eventually in the $Bs. NASA can't offer me anything close to that.

"And why there ain't no info about this STDTS technology anywhere around to look at it? It's been a year tha this has been announced"

http://www.prlog.org/12376829-toronto-space-conference-1st-time-marshall-barnes-stdtstm-warp-drive-tech-presented-outside-usa.html

It was actually first announced in 2001 on the Sterling  Show with No Name on WTVN AM and then the following year on the front page of the Circleville Herald. There's been a lot on the web but some aren't there anymore, including USA Today and a bunch of foreign stuff.  I'm concentrating getting the proof of concept documentary finished which will cause a tremendous amount of exposure internationally. 

London:

You blew it. You like to think that there's all this stuff that I don't know and you have no idea of what I do know. I haven't told you half of what I know of these two clowns you worship but what I have, should have given you pause. So I'm pulling the plug on this conversation because my suspicions about you indicate anything more would be a major waste of my time.

I will leave you with this - http://historybizarremysterious.blogspot.com/2012/03/strange-case-of-dr-david-lewis-anderson.html.

The mention of "time wars" by Anderson is proof positive he is a fraud. Anyone, and I mean anyone that knows, understands and or works with temporal mechanics would know that what he describes is ridiculous and without merit. I should know - I wrote a book proving the scientific impossibility of paradoxes and thus the ludicrousness of going back in time in order to change history, and invented the formula that proves it. 

I can only feel sorry for you because you are so deluded into believing the nonsense of a couple of whack jobs that you can't recognize the real physics when its presented to you.

Bye, Mein Doomkopf.

London:

My book proves how time travel would and wouldn't work, including the popular theories which in reality wouldn't work and why. Both Basiago and Anderson have made statements which can be scientifically disproved because they violate specific spacetime geometries that would allow time travel to be possible. Ronald Mallett doesn't know what he's talking about either and I'm not the only one saying so and I know Mallett.  On October 15th I will be releasing the definitive proof that Mallett's idea for a time machine won't work and his understanding of time travel physics is less than cogent. This will consist of both a video presentation and a paper which I will post on Researchgate. 

Your talk of "super incredible teleportation" makes it plain that you're in some kind of fantasy world. You lack the ability to even describe how such a thing can be accomplished and if you try, I'm betting that you quote some malarkey by Basiago and when you do, I'm going pulverize it with the most destructive deconstruction you've ever seen, because Basiago has no cogent explanation for his claims. Look at him in action: https://www.youtube.com/watch?v=Rv6RXM1kihI There's so much wrong about what he saying, it's laughable. But go ahead - believe it if you want. I don't care, since I have real projects to work on which I've shown, demonstrated and lectured about - http://www.thegreattimemachinerace.weebly.com. which is more than either Anderson or Basiago has ever done.

Good luck "super incredible teleporting" yourself!

1. There is the correct someone out there for everyone.

Almost sounds like dating thing...

2. Again, it is who you know, not what you know.

Not in science. Knowing the correct information, methodologies, facts, techniques, theories, etc is what matters, NOT personalities.

3. Ronald H. Mallet was not the correct one for me.

First of all, his name is Ronald 'L.' Mallett. Second, when it comes to understanding the nature of time and especially time travel physics, he's not the right one for ANYONE.

4. Regardless, of what you did in physics and not time travel. 

Incomplete sentence structure. Incomplete thought. 

5. Einstein never stated the time travel to the past impossible but it violate cause and effect which is fine with the holy bible of Jesus Christ.

Einstein didn't like the idea of time travel to the past but that doesn't matter since he didn't like the idea of spooky action at a distance either. Anyone who thinks time travel violates cause and effect doesn't understand the structure of time that would allow for time travel in the first place. If they did, they would realize what ALL the solutions are for the unanswered questions and apparent paradoxes in the subject matter, which I do and published in my book.  The "holy bible" of Jesus Christ makes no mention of time travel.

6. As long as the wish is not harmful but supportive and helpful. 

Wishing has nothing to do with the spacetime physics of time travel unless of course you live in a fantasy world, which would mean you're on the wrong site.

7. With God you can anything.

Another incomplete sentence structure. Tisk, tisk, tisk.

8. Regardless of the theories, Einstein died in 1955. Andrew D. Basiago came in 1978.

9. Regardless of the theories, Einstein died in 1955. Andrew D. Basiago came in 1978.

Yes. April 18th, as a matter of fact. Too bad, I would have liked to have had him around longer, at least as long as we had Wheeler. As for Basiago, he wasn't born in 1978, he was around long before that, which doesn't matter as he's worthless as a source of ANYTHING pertinent to the study of time travel outside of pure science fiction.

I asked you several technical questions some time ago and you couldn't even address those. If Anderson and Basiago were as knowledgable as you claim, you should have at least known the answer to one of the questions from your study of their "work" and information. Your avoidance of any actual issues related to time travel, in favor of prattling on and on about "secret laboratories" and citing religious references indicates that you not only know nothing about the subject but lack the grey matter to even process it at the most pedestrian level. In fact, I doubt that you are actually being honest in your alleged desire for information about time travel as you've selected to pass up credible information that I've supplied you that anyone really interested in the topic would have flipped over. Instead, you insist in obsessing over two men that have supplied no pertinent information at all, and in certain cases, the information has been shown to b absolutely fraudulent. At the same time, I've considered that you might be a troll looking for information, and your handler opting to have you provoke, with idiocy, thinking I may starting providing you with more and more advanced information in an effort to persuade you. Tell 'em I said, 'Nice try but no dice,". I wouldn't share anything on an advanced level with anyone as appearing to be as disconnected to reality, as you. Seriously. 

If you're not just a troll, you better be careful. The kind of people you're trying to connect with are dangerous and I know of a number of homicides and attempted homicides associated with people like them, that sucker in dweebs with tales of time travel and secret labs, with absolutely zero proof of anything cogent whatsoever.

Whatever...

London:

LOL! I warned you. You'll get exactly what you deserve. Be sure to leave emergency contact information with someone so when and if you vanish, your relatives will know what to do with your estate. This is like watching a lamb wander into the lion's den but hey, I've got nothing to do with it. 

BTW, I don't mean "vanish" as in actually leaving via time travel. I mean vanish as in nabbed via foul play and ending up like Philip Taylor Kramer.

So long, Doomkopf. 

Stephen Hawking's Feedback Mistake https://www.youtube.com/watch?v=qdbbXEMkov4 A video for SuperScience for High School Physics showing how Hawking was wrong about closed time-like curves and wormhole time travel.

London:

I'm not talking to you anymore. My Hawking post was for anyone interested in real temporal mechanics issues, not fantasy. If it were for you, I would have addressed it so. You are beyond comprehending anything or discussing the most pedestrian level of time travel and so I have no use in continuing with you. 

You're correct - my book has nothing to do with the secret government abilities in time travel, and why would it? It's a physics book based on a report I wrote for Congress. It even says that on the cover. So get this straight - you're a nut case. You exhibit all the symptoms of a paranoid schizophrenic - delusions, past history of psychiatric involvement, dependence on medication, persistence in belief in fantasy even when presented with evidence that it is fantasy, rejection of reality, invocation of religious mysticism...

You came here asking for help and information and I've tried to help you, even when it was apparent that you had been woefully duped beyond what I would expect anyone with a background in physics would have been. But you have been relentless in your advocation of what I could prove, with evidentiary material, in a court of law, is nothing but pure rubbish and it has done nothing but make you clutch that filth of faulty physics even more. Fine. I don't care.

So I'm not addressing anything else to you, so quit acting like I am.  I might as well try talking to a cockroach...

For anyone who is interested, here's a link to a paper I just did that proves that Ronald Mallett of UConn has been hyping a time machine design that will never work - https://www.researchgate.net/publication/283042457_RING_LASERS_CLOSED_TIMELIKE_CURVES_CAUSALITY_VIOLATION_AND_THE_TOTAL_DESIGN_FAILURE_OF_RONALD_MALLETT%27S_TIME_MACHINE_OF_SPACE-TIME_TWISTING_BY_LIGHT

Sorry because the long time.

Dear Ahmed, if the travel implies a difference in the first molecular state regarding to the second, I can see it is because we are a mix with our environment. (Fernando Alonso (driver) says that he cannot talk about only a driver, he need to talk about the driver and her car, because both are one), I see the same about  a thing in our universe, space or environment. Exist an interaction in both directions between the thing and its environment. (The continent and content). If we change the environment we change anything else in us. (We must look if we change the basic conscience too, in the "future" research).

Dear Asmat, about grand children... the problem or virtue of time travel is that if in the future if we CAN travel in both directions we can have the "future" here now, in our present... or in our past... (Our: we now).

Marshall, your study is only theoretical, is it?

I want to talk about practical experiments better, if we can.

Best regards to all you. Ana

Ana:

No. My work is not theoretical. It is practical, technological and happening in the real world right now. I already have the first working time machine in the world that opens micro wormholes. Today, I was able to develop a method that I feel will prove conclusively that I can control were the micro wormholes open up. This is all based on the work of the late John Archibald Wheeler of Princeton. I am establishing the first, time travel development program in the world, with the every intention of making human time travel possible by the end of the decade.

Hi everybody

What is time t? Is it exist?

Time is an artificial variable added into space just to arrange the occurrence of events ( position of objects, velocity, acceleration,etc..)

As a simple example consider the circle x2 +y2=1 it is a set of points (particles). Introduce t to parametrize the circle as x = cost,y=sint, t belongs to Real numbers. The two equations represent the same set of points, but this ( nice intruder t) allows us to describe the location of points compared with t.

at t = 0, the point(particle) is at (1,0). Now for t = r, the location of the point is at (cosr,sinr). As t varies, the position of the particles varies too.

As a consequence of this idea, we can understand the velocity as the rate of change of their positions related to some observer). In our example, if we write the equation of the circle in this new way: x = cos2t and y=sin2t. Now, as t varies, the particles on this parametrization move faster than particles in the first one.(the velocity is twice), even the sets are the same.

However, if we remove the particles (circle), then t cease to exist!!

The sun or the moon create our time (days, nights, hours,

months,. ). They considered as references to arrange events. Then replaced by pendulums (machines, watches,.) just to organize our life (local events). What about the other galaxies? Creatures underground? They need other references

(observers) to arrange their local events.

Is there a global time for all places? I think that we can consider the light speed as a reference, simply because it is the same regardless of the observer.

I would like to say; time is an artificial variable. We can live it, feel it, but it will disappear when we leave.

Best regards

Dear issam I agree 💯 % with you excellent information on Tim , personal Tim don't exist in my thoughts , all the best for you!

Time travel is dependent on relative position in a moving body with respect to The Sun in solar system. So, when we are moving around the earth in an aircraft, we are making time travel. By this method, it is physically possible to go back in time up to a maximum limit of 24 hours. When we are travelling to another planet in solar system, time reference changes. In that case, it is not possible to go back in time unless we travel faster than the speed of light. If we travel out of the solar system, the concept of day and night must change completely. Till we enter another solar system, there will be no day and night. In another solar system, the concept of day and night must be entirely different. Nevertheless, we cannot go back in time unless we travel faster than light.

I invite criticism to improve the concept. We must be able to develop a mathematical model of time travel.

Regards,