Is Time Travel Impossible?

Is Time Travel Impossible?

If time travel turns out to be possible, I
hereby invite future time travelers to join me on set I’ll post the address one year from today. Okay. Right now. Well that’s a bummer. Time travel stories are cool because both
the past and future are somehow more interesting than the present and because everyone secretly wants a do-over. But so far it appears we are doomed to live
consumed by regret in the eternal, boring present. Time marches on, inexorably and only forward. Or so we thought until Einstein came along. His special and general theories of relativity
changed the way we think about time forever, and believe it or not, their raw equations
permit time travel. They even tell us how to do it. So let’s review the possibilities, and decide
how possible time travel really is. The first approach to time travel uses only
special relativity, which describes how intervals of time and space are stretched or contracted
depending on relative speeds. A fast-moving spaceship appears to experience
a slower rate of time compared to someone waiting back on Earth. Do a trip around the galaxy at close to the
speed of light and very little time might pass from the perspective of the traveler. But they’ll find a minimum of hundreds of
thousands of years have passed when they get back to Earth. However, that’s a one-way trip in time, and is really
just traveling in the same temporal direction at different rates. So the original Planet of the Apes style time
travel is possible. But it’d be nicer to be able to go back
in time. Actually, the math does sort of allow that. The spaceship’s clock slows down as it speeds
up, and it stops completely at the speed of light. And at faster speeds, time should actually
tick backwards. So if you could travel faster than light you
could navigate a path to a point in spacetime before you departed. We saw how to Iconstruct such a path in a
previous challenge episode. Of course we know that the laws of physics
forbid faster than light travel. Or do they? In order for any object with regular mass
to even reach light speed it would need infinite energy – which can never be obtained. But notice I said “regular mass.” We can hack the equations of special relativity
by allowing mass to take values in the weird realm of imaginary or complex numbers. An object with imaginary mass is now restricted
to only traveling FASTER than light, never slower. That means it can only travel backwards in
time, not forwards. We call a particle with imaginary mass a tachyon. If we could control tachyons then perhaps
at least we could send information back in time. But do they exist? Does imaginary mass exist? This is an example where the equations
of a theory technically allow something to be true, but there’s still no good reason
to believe that it is. We’ve seen no evidence of tachyons, and common sense tells us we probably never will. So special relativity isn’t much help. Fortunately we still have the general theory
of relativity, which incorporates special relativity, but also explains the force of
gravity as a result of curvature in the fabric of spacetime due to the presence of mass and
energy. But GR describes a warping of space AND time. So maybe we can warp them enough to take us
back to our own past. The best-known approach is through something
called a wormhole. A wormhole is a particularly bizarre hypothetical
consequence of general relativity. Now, if space can be warped, then perhaps it can
be stretched in such a way as to create a tunnel between two points – and one whose
internal distances could be very short, even if the mouths of the tunnel are far apart. This has the obvious benefit of allowing you
to teleport between distant points in space, but also between distant points in time. This is how you do it: take one stable wormhole
large enough to be traversed. Accelerate one end to close to the speed of
light or drop it into a deep gravity well – its rate of time flow will slow relative
to the other end of the hole. Now bring the two ends back together. They will be offset in time: one portal permanently
stuck in the past of the other by some set interval. Travel through the “future” end
and you’ll exit in the “past.” So this all sounds straightforward enough. But can wormholes even exist? There are a number of ways they might – from
connections between universes in the interiors of black holes to miniscule wormholes appearing
and vanishing on the tiniest scales of space and time. Now, these deserve their own episode. But for now, to build a useful time machine a wormhole has to be large enough to fit through and it has to be stable. The equations of GR do permit large wormholes,
but they are definitely not stable. They collapses on themselves instantly, leaving
inescapable black holes. In order to keep our wormhole time machine
operational, its throat needs to be kept open. We need to counter gravity, and to do that
we need another probably-non-existent form of mass – negative mass – also referred
to as exotic matter. As far as we know, mass can only take on positive,
real values, so a requirement of negative mass seems a non-starter. However there may be hope. Really what we need to open the wormhole
is a negative energy density. Some have argued that we already produce this
in the Casimir effect, in which the energy of the vacuum is lowered between two nearby
conducting plates. However there’s no clear path to translating
this to a large-scale negative energy distribution that could keep a wormhole open. And in fact we’d need entire planets – perhaps entire stars converted to negative energy to do this. Some other time travel options also involve
using negative energy densities – for example the Alcubierre warp drive, which we already
covered. In short – if you have exotic matter you
can probably time travel. But is negative mass-energy as much of a non-starter
as imaginary mass? While the actual equations of general relativity
themselves don’t prohibit it, there are a set of secondary rules in GR that do. These are the so-called energy conditions. They’re a set of requirements that do things
like prevent negative energies and enforce energy conservation. But the energy conditions don’t have a really
fundamental basis, and they’re seen to be violated in some cases – like with the Casimir effect. We can’t completely rule out wormhole or
warp drive time machines based just on the energy conditions. And as it turns out, there may be other ways to build
time machines without either negative or imaginary masses. One example is the Tipler cylinder, conceived
by Frank Tipler based on a solution to the Einstein equations by Willem van Stockum. It’s simple: just build an infinitely long
cylinder of extreme density and set it rotating insanely quickly about its main axis. It will drag spacetime in its vicinity into
a sort of vortex. This generates sub-lightspeed paths through
spacetime that form closed loops, ending up back where they started in both space and
time. We call such paths closed time-like curves. A spaceship traveling along one of these curves
could return to a point in its own past. If you don’t have the budget for an infinitely
long cylinder, you could try building just a very, very long cylinder… and be horribly
disappointed. Stephen Hawking showed that unless the cylinder
is infinitely long this doesn’t work – unless you also modify the spacetime with negative energy. In which case you might as well just build
a wormhole. So it turns out that it’s not so hard to
find solutions in general relativity with closed timelike curves. Kurt Goedel, famous for his incompleteness
theorem, discovered one and he wasn’t even a physicist. His involved an entire universe, rotating
about a central axis and with matter and dark energy perfectly balancing it against collapse
or expansion. So to build this time machine we just need
construct an entire universe – which allows us to travel back in time only within that
universe. Thanks Goedel. Dragging the fabric of space in a circle
can give us our time-loops in very special, and frankly useless cases. Another one is the interior of a rotating
black hole – a so-called Kerr black hole. The maelstrom of spinning spacetime may generate
closed timelike curves deep down below the event horizon. So that’s fun: you can travel back to your
own past, but never to the time before you fell into the black hole, which is probably
the only thing you really want to do at that point. Unless it’s an Interstellar-style black
hole . . . general relativity doesn’t directly refute black hole time machine libraries. Yet. So it seems we have lots of ways to send things
back in time, but it all seem useless for actually making time machines for one reason or another. But the weird thing is that we don’t know
of one consistent, fundamental law in physics that prohibits true time travel. And yet most physicists still think it’s
impossible because time travel threatens the common-sense chain of cause and effect. It threatens causality. Break causality and you can create paradoxes–
time-travel to kill your grandfather and you would ever be born to time travel in the first
place. But there are no true paradoxes – only seeming
paradoxes that point to a gap in our understanding. Stephen Hawking put it nicely with his Chronology
Protection Conjecture. It states that the laws of physics will always
prevent time travel or allow it only when doesn’t cause paradoxes. In other words, the universe has to make sense,
time-travel or no. One way for a closed timelike curve to exist
without causing a paradox is expressed in the Novikov Self-Consistency Principle. Igor Novikov suggested that closed timelike
curves are fine as long as they’re self-consistent. As long as the backwards time-traveling configuration
of matter always leads to exactly to the same forward-traveling configuration. In other words, the loop creates itself. So I don’t know – you try to kill your
grandfather, only to become your own grandfather? Like Fry, let’s not think too hard about
that. An alternative lies in Hugh Everett’s many-worlds
interpretation of quantum mechanics, in which every possible universe exists, splitting
off in an infinite tree. So if you travel back in time and prevent
yourself being born – no problem – your photo doesn’t slowly fade away because you
were still born in that other timeline. Or time-travel could be genuinely impossible. Kip Thorn suggests there should probably be
one fundamental law of physics that prohibits it – for example, the quantum vacuum may
be unstable in the infinitely iterating loops of a closed timelike curves. On the other hand, Kip was the consultant
in Interstellar, so who knows what to believe? In actual fact we can’t know until we have
a full theory of quantum gravity – until then we’re working with the approximate
theories general relativity and quantum theory. Approximate theories can make bad predictions
– like the possibility of time travel. One final argument that time travel is impossible
is that we don’t see time travelers. Stephen Hawking put this to rigorous test
when he organized a cocktail party for time travelers, only advertising the event after
it ended. Tellingly, no one showed up. Though I don’t know – maybe there was a slightly
better party somewhere else in, like, all of history. For now we seem doomed to time travel only
forwards, and very slowly at that. We remain firmly in the grip of that one dimension
that we can never halt nor reverse it’s pace: time.

100 thoughts on “Is Time Travel Impossible?

  1. I'll settle for fast-forward only travel. I could just put a few bucks in the bank and travel a few thousand years into the future and come out a billionaire. Or if I see a girl I like but she's too young I could remedy that too.

  2. THEORY: Assuming we could contain internal inertia (i.e. being flattened to the atomic level due to acceleration), then essentially stacking rail guns could push us faster than light (i.e. a rail gun launching, then another rail gun theoretically doing the same). Do that 3 times over, and it is possible, assuming physics don't change. You're welcome.

  3. Time travel is imposible, for the simple reason that time doesn't even exists. What we call time is actually movement, and in the theorical experiment of the planet of the apes one thing that is not in account is that earth will still be moving, and it's "future" is not located in the same place, but in the place where its movement will take the planet. So, no matter how "fast" you can travel, the movement of earth won't go faster. Come on guys, time is concept that abstracts movement and is useful for mathematical models and for applied physics, but you can't explain reality with a fiction.

  4. If there is a president of the United States I hereby invite them to come visit me.

    I'll keep you all informed as to the results.

  5. this is what we call as hope… that is the reason why god create limit to every living thing and logic behind its limitation… u try to cross that limit u will end up crazy… just be normal dude and accept what u have now.and move on…

  6. There was a better party to go to. And if you send out an invite like that again, make sure you have crumpets. Just showing up to prove you right is not enough motivation.

  7. Not possible.
    I hate this theory. It’s the same theory that lumps in the spaceship clock nonsense and also says if you go the speed of light somewhere and come back your friends and family will have aged while you haven’t.
    Now let’s say the human body can survive that speed… you are ASSUMING that your body’s biological aging and comprehension slows down just because it is moving light speed. The object (ship and human) are moving light speed not the whole existence outside of it. It does not make sense because it is nonsense.
    Is light speed possible? It could be.
    But it has no effect on universal time.

  8. I must be the odd-one-out .. because I'm not really interested in "do-overs", but rather to confirm historical events and to keep accurate historic records.

  9. Time travel is impossible because you won’t be able to travel to a universe before it was formed. There will be a limit on how far back you can travel. Also because the universe is expanding you might travel in time just to find yourself in a different part of the universe where the earth hasn’t arrived yet.
    So you must know the exact location and the exact time where you are going to travel.

  10. Not to soil the carpet but one of my favorite sayings is, God would drop dead of boredom if the future is known.
    Try replacing imaginary numbers with the life energy Wilhelm Reich was killed for reporting on. Same: Ether = Higgs Boson and it attempts to conglomerate to higher concentrations of itself, which explains how God came to be, to some degree. My people mathematicians perish are losing their marbles for lack of knowledge.

  11. The reason you don't see any time travelers now it's because no one from the future would come back to when Trump is president.

  12. Even if time travel was possible, it would not actually work.
    Let's say a guy built a time machine in his basement, and transported himself back one year.
    Well, guess what, he would end up in empty space, cause the planet earth has traveled a long distance in that year.
    So if you could built a time machine, it would actually have to be a "space-time" machine, and you would need to be on a spaceship to do it.
    Cause not only are you dealing with "time" itself, you also have to take into account the distances everything in the universe has traveled over the course of that year.
    So not only would a person have to transport themselves back in time, but the earth itself too, just to ensure the guy ended up on the same spot he left from.
    Well, now this concept is just getting silly.

  13. So if man can keep from destroying itself would they have eventually basically gained the right to develop a place where time doesn’t matter, and if that’s the case then they are here now.

  14. Hey I love this video, really fascinating ,time travel .wow ,wow, it's probably the biggest thing you could have a talk about .I always thought time travel forward was possible. just saying endpoints to this all some people claim to be time. travelers .so if we don't see them that is because we wouldn't believe there stories on time travel anyway. So thank you for this wonderful video.

  15. I'd say, we'd never be able to get into the past. It just isn't possible, because then, the laws of physics and life would get weird. You'd be able to destroy your own existence which in itself is leading to a paradox. While the idea sounds cool, it's terrifying.

    Also, the idea that every backward time travel creates a new universe is cool but then we run into even more problems: How does our universe interact with the other?
    How does this individual is able to get back?
    What happens, if you'd destroy your existence in that universe?

    I think, it's good enough, that we are able travel into the future, if that's really necessary. I do think, living in the present is the best, though. Trying to live as best as one possibly can and tinkering your own future without knowing the affects or stretching your life enough.

  16. Does the universe even support the concept of past and future? I have never seen any evidence from any experiment that even slightly suggests that there is a past or a future as far as reality is concerned. It doesn't seem like the fabric of reality stores this information in any concrete way.

    Our minds perceive the past as memories by data that is stored in the form of chemicals and electricity in our minds. The future is perceived as predictions of what's going to happen. A video can be rewound, paused, and played. The data for the past, present, and future are stored on some medium (magnetic fields on film or disks or via tiny switches in a solid state drive or as electricity in capacitors in RAM). We construct ways of formulating the concept of past, present, and future as an identifiable time dimension. It's part of how humans and probably most other forms of life on Earth perceive the reality around them.

    However, it doesn't seem like reality itself has any way to store this information. There doesn't seem to be any property or dimension of the universe that stores previous or future states of reality itself. Reality clearly stores positions using space and objects exist through the interactions of many other forces.

    Certainly, the universe does keep track of the rate of change of things in an area. This rate of change can be affected by the fabric of reality being stretched. Currently, we know that space and the rate of change of things within space seem to be linked together. Space and rate of change can be affected by the presence and movement of mass.

    The larger an object is, the more it bends space/roc.. the faster it moves, the more it slows roc and stretches space.

    All of these concepts seem to relate to experiments and experiences that have been observed. However, "time" as we perceive it has not revealed itself so far. I don't think time travel forward or backwards is ever going to prove to be possible, simply because time doesn't exist to travel through.

    You can always hibernate and wait for time to pass to emulate traveling forward in time. You can also achieve a similar effect by moving very quickly and slowing your rate of change compared to some other region of space. This isn't time travel anymore than hibernation is. You're just waiting for time to progress elsewhere.

    With regards to how a wormhole could be used to travel back in time: I think that if you were to accelerate or drop one end of a wormhole into some space that "slows time for it" all you would achieve is creating a region of space around the exit of a wormhole where the rate of change happens very slowly. Essentially, if you were to travel through this wormhole, you wouldn't find yourself back in time per say. You would just exit the worm hole into the same time you left… the region around the worm hole might seem as though it is from the past.. but as soon as you leave the area that was affected by whatever slowing method you used, you wouldn't find yourself back in time. Everything would be normal. The worm hole wasn't anchored to some point in the past… just the things around it would have done less stuff because the rate of change there was slower.

  17. If someone were to travel back in time and make it, that would change the course of existence, effectively making a new universe.
    That's how I'd explain it to myself… if it was or is possible, the time travellers went to a different universe, leaving their own intact.

  18. Instead of trying to make a machine that travels back in time. Why not try to build a machine which is able to look back in time (In other words, predicting past events with 100% accuracy.)

  19. What about this paradox then: if I go back in time before I was born, what happens to my body matter? It already existed at the time but was elsewhere.
    Can the same matter or molecules be at different places at the same time?

  20. I really have trouble understanding relativity and the twin paradox. I know GPS satellites have their clocks adjusted for speed and gravity, but my brain still doesn't understand. Let's say I want to go to Proxima Centauri for vacation. I take my spaceship which can go light speed. I reach there, take some pictures and turn around and go home. If Proxima Centauri is 4.22 light years away, shouldn't the trip be only 8.44 years? How much Earth time did the trip really take? How much older is my twin?

  21. Even Rod Sterling, RIP, would be impressed with PBS Space Time.
    Where is the legal disclaimer?
    “For entertainment purposes only”

  22. I plan to go to Hawkins's cocktail party, but I haven't left yet. If someone else from the future had already left to go to his party, then this action would have occurred in the past. Obviously, those in the future planning to go to the party haven't left yet either. Or, people from the future can not travel to the past because the future does not exist yet. In addition, they can not travel to the past because the past exists only as information. Although, if one could drive one billion light years per hour they could drive to a galaxy one billion light years away in one hour, visiting this galaxy as it was one billion years minus one hour ago, or not. The universe is expanding, spacetime is expanding, time is expanding.

  23. Well maybe the Tachyons come from the end of the universe traveling to beginning as we travel to the end, we haven’t crossed the midway point yet so we haven’t seen them

  24. If time travel were possible in order for you to travel into the future (non-relativistically), you could not meet your older self. To do so would create a potential paradox. If you were to meet your older self (by say, 10 years) that would mean you had to go back at some point in order to become the older self you just met. But what if you decide not to go back and age accordingly? You could either choose not to go back or even destroy the machine preventing your going back — either way, you set up an impossible scenario. Therefore you cannot meet your future self unless you somehow become forced to go back, and that potential paradox seems just too likely to be possible.

  25. You didn't mention the Ronald Mallett method. Twisting space time like a Tipler cylinder but using light instead of matter. Several of the details of his method are disputed but not the basic premise which is consistent with GR.

  26. The truth, It is and it isn't. You can time travel to the past but not the future. Reason, You have already made your past so it is possible to go back in time but your future isn't there, nothing is there. Also, going back in time, you can only go where you been see who you already seen. Can't go places you never been to or can't see anyone you haven't seen.

  27. I guess that would depend on your definition of "Time Travel". You could fly from New York to Los Angeles and gain a few hours. Would that be time travel? Albert Einstein believed that time travel is possible by bending space. Personally I don't believe at this time that it is possible but it's an interesting subject and I have heard plenty of stories of "Time Slips".

  28. Make space time collapse on itself and try use higher dimensions to make a navigation around a black hole towards the bottom of curved space time. Seems like something to check out.

  29. YOU CAN’T Ondo THINGS. I would travel in time and visit Buenaventura-Colombia in 1929 and see who was my Abuelita Miryam father. My great grandma Delfina never told her the name of who her biological father was.

  30. I once time travelled to 2000 yrs the night our lord jesus christ was born.i came back like I never moved an each from earth..

  31. Any other time travelers watching this just chillin. Glad there is good water to drink and cleanish air to breathe? really the best time to be alive imho. mmorpgs are so fucking fun!!!

  32. If you could theoretically travel backwards or forwards in time it would change time for you. It might make sense that spacetime for everyone else would be protected from paradoxes caused by one person. If you built a spaceship and traveled near the speed of light to our nearest star and back again, only the time that it took to complete the trip would have passed for you, but for everyone else it would be business as usual, so to speak.

    If you could figure out a way for matter to travel backwards then you would probably arrive in a past timeline separate from everyone else going forward, that way preventing paradoxes from affecting people in the timeline you left. Going forward the future changes would only be experienced by you. Perhaps there are safety measures in place protecting the system as a whole.

    I don't think it will be possible for matter to travel backwards in time. But information theoretically could. You could perhaps store information using photons stored in some sort of holographic matrix, a Photonic Holographic Oracle of Information. Perhaps in the form of the sender. You deliver a short message to the past. Lol maybe send them a warning about the future, warning signs to look out for in the future…. hmm beings made of light delivering a message of a coming reckoning and potential apocalypse for humanity if it can't get it act together… sounds familiar… of course i jest. Or am i? It's fun to think about.

  33. If I could travel back in time i'd create a branched reality where rome never fell, or if the central powers won WW1

  34. If we could go back in time imagine all the bad historical things we could prevent? Maybe animal extinction, we could save lost cultures and traditions of Tribes and Clans and Kingdoms that got destroyed in history, we could’ve seen first humans, we could finally prove all the debatable things in history since we’d be able to see it in person and probably record it, we could see extinct species etc, you’d probably have to wear like a giant suit of armor tho since back then most people would probably accuse you of being a witch and shoot you, but we can’t hurt anybody anything could happen

  35. Everybody says that time travel is impossible just because we don't see time travelers, but has anyone thought that they can't get their cover blown due to a law of time travel we haven't discovered yet?

  36. I'm a time traveler. Sorry I didn't meet up with you, I was busy hiding pubescent me some pornography as I'd promised earlier at the time.

  37. ok, we know HOW to do it. Now we just need to know, what happens when you DO. Does what the time traveler do CHANGE the present, does the world experience what happens in the past in the original timeline before you time travel, or does time travel open up alternate realities

  38. If I could time travel I'd start with the Jurassic period and work my way back through the 1400s 1800s 1900s visit all times before my birthdate I wouldn't change anything in the past and I'm not interested in the future I could change that at any time

  39. So time travel is theoretically possible, but it's currently not possible for us to get to the speed at which time travel becomes possible. Am I getting this correct?

  40. Can you add the link to the future episode on Wormholes here and in the description once it is made? 4:40 – 4:52

  41. Girl: By any chance do you know? kyouma.

    Boy: I don't think so, no.

    Girl: Hoouin Kyouma? Not your average clipboard jockey.

    He's a mad scientist crazy as they come

    To call him an intense personality is underselling it, his friends used to make fun of him for rambling 24/7.

    Talked about taking over the world inventing time travel blah blah no one ever believed him.

    But he did actually stumble onto one of the greatest discoveries of mankind,

    Something no one else could see but him and it wound up being a terrible burden.

    Once the genie was out of the bottle all it ever seemed to bring was pain and suffering.

    What began as his greatest triumph turned into the fight of his life

    He struggled tooth and nail to save the people he loved.

    In the end kyouma managed to put a lid on Pandora's box.

    He was a hero.

    But not a single person had a clue what he'd done, not that he cared.

    What's recognition to a mad scientist people went on laughing at him, and he just continued rambling?

    Boy: Poor guy, how sad.

    Girl: Sad? You don't think it's a little romantic?…

    PS, leave time alone

  42. Time travel is completely possible, you just have to wander around San Dimas and find the right phone booth in the circle k parking lot.

  43. Time travel what is time ..its a theary like gravity B.S. …SIRE TIME TRAVEL YEAH ITS POSSIBLE REMEBER

  44. The concept of Time Travel is a little misleading. The problem is, there is no past, there is no future. There is only the present.
    Time/ Spacetime is like a rolling wave; it only exists as long as there is motion. If the rolling stops, the wave no longer exists. We get confused because we can remember the past, but fail to realise that we can only remember in the present. Similar with the future. We can predict or ponder what may happen, but all that speculation is done in the present.
    And that rolling wave that generates time moves at the speed of Causality… that's too slow for you Matt?

  45. I absolutely fucking hope it's not possible. At least not into the past. Yeah it would be cool if I was the only one, but I don't want the powers that be sending people back to change a bunch of shit and make the world into an even worse place than it can already be. Like going back to when Washington and the other founders of the States and making them change a bunch of shit so that we're all mental slaves to them. Wait a minute, everyone is hooked on their phones (AKA tracking devices) anyhow so maybe they did. Damn!

  46. Here's the question… What is SPEED? What is acceleration? What is accelerating?

    Time Travel: To travel back one would need ot calculate their position anywhere in space ot arrive there or else going back in time, you would be lost in deep space. The sun has its own orbit. Basically whne travelgin in time. Your position is mute compared to everything else, so it proceeds backwards or forwards but your positions needsto travel to maintian or keep up with it. What is the persons translation drift. Menaing the momentum of earth and Su ntraveling gives us a arm speed compared oteh galaxy and that galaxy has its own arm speed. Ie movement of movement which al lhas a exertion of error. So if one travels their location would translate to a different location. Imo, theory.

    This translation effect of conserved mommentum is interesting, since if we stopped all movement in a isolated field. IT would make the universe look like a spinning blurr of colour and light, in determinable to anyone else, because of our persective. Its pining fast, in some cases faster then liht ,because speed isa strange phenomemon. Meaning if we use an archaic method of accelaraiton we are cahsing calcualtign pie. We can never reach the speed of light, since its all reletive and we emit light in a sense. We are moving…

    How do we then time travel, is to address what langauge is and what is CLOSER to the speed of light?

    Which means one can travel faster in a localized environment.

    I think electromagnetics offer an interseting array of test. Menaing can we acceralte a localized group with magnetic fields, meaning we change the field in which we go faster or slower then speed of light by manipualting the field strength of what light travels in. This would allow the control of time. Why usea square ruler ot measure pie, change the language of udnerstanding. Use the speed asa red hering… it offers amechnical draw back. If one changes the field of their environment loclailly by accelerating a isolated field. How does speed and distance and travel work. So wapr theory works on the bending of space, hwo does one bend the field of space… Anyways using travel as time, one could go to any palce in the universe at any time because you can be anywhere, by the motion of translation. SO your no longering measuring speed as a form fo aceleration. You mesuring movement of bodies with bodies that have a meaning. Its reletive to its point of origin!

    So this also goes into the theories of time viewing,a device ot view any event in time, which is possible. Since we are seeing the obuncing of light. Light which is looks invisible. The universe has permanent image of everything in time forever and ever. Its al ldata dn recorded. This would require calcualting extoci light particles and direction ,which would take computing power beyond comprehensio nto make use of an image from how light works… of course the film is always passing by.. as a joke. Howeve,r if yo ucan view the light emitted it would be predicatable.

  47. If the universe is constantly expanding, and everything is effectively becoming larger, then wouldn't someone going into the past be the size of the moon? What accounts for that variable?

    Faster than light means you go backwards? That is all over sci-fi, like The Flash, but is there a source for it?

  48. of course it's possible. All you have to do is harness quite literally every single fragment of energy, in the entire universe and contract it. If time travel was possible it's already happened and these are the results.

  49. Hi. I'm a time traveler from the future. You forgot to post the address.
    Also, Carl Sagan's AND Steven Hawking's similar invitation footage has all had the address censored out of it in the years since, so I couldn't visit them. 🙁

  50. Well… technically he said that he would give the address to that location in one year. This whole thing is contingent on him not forgetting for something happening to prevent it. Who knows, he could have an eyebrow related accident some time in the coming year.

  51. Do not try and time travel, that's impossible. Instead only try to realize the truth. There is no time. Then you'll see that it is not time moving, it is only yourself.

  52. Stephen Hawkins did have that party and people showed up, only problem is…….it was on Jeffery Epstein rap* island. His aids have said he vacationed many times on that island and got massage therapy while there.

  53. The issue with time travel to the past is that the exact position of those atoms is not recorded anywhere. The past isnt just a checkpoint, sitting there, waiting for someone to travel to it. It's gone, it's happened, it is now the present. The only way to get around this is travelling to a parallel universe with an identical past to ours.

  54. Shoppinglist: tachyons, exotic matter, custom universe, quantum relativity theory, blackholes, infinitely long tube and enough energy to rotate it.

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