Is Time Travel Really Possible?

Imagine you own a watch that let’s you travel through time. One day, you get the bright idea to travel back to the 1920’s to mess with your grandparents. You press a few buttons, and suddenly you’re standing beside old Pappy who is taking in the scenery at the precipice of the Grand Canyon. Since you’ve never been the biggest fan of your grandfather, you decide to push him over the edge. Gravity does its thing, and a few seconds later, no more Pappy. But wait, if you killed your grandfather before he ever met your grandmother… you wouldn’t have been born to be able to go back in time and kill him! Here’s the problem. If you didn’t exist and killed your grandfather, you couldn’t have killed him… Because you didn’t kill him, he’s still alive. but that would mean that you yourself would be alive and now you can go back in time to kill him. And so the endless loop goes on. This is called the Grandfather Paradox. And it’s part of what makes time travel so interesting. The grandfather paradox deals with time travel on a significant scale. But why don’t we start with something a little smaller? Let’s say you and I are wearing identical watches and we synchronize them right before I blast off into space. In the space shuttle, I’m traveling at roughly 28,000 kilometers per hour relative to the Earth. If I make a few orbits around the Earth before I return, when we compare watches, we’ll see that less time has passed for me. A very, very tiny amount of time, but is there nonetheless. This is called time dilation, and it simply means that according to Einstein’s theory of Relativity, Time measured along different trajectories is affected by differences in either gravity or velocity – each of which affects time in different ways. One example of time dilation is when we compare the passage of time on the ISS versus on Earth. After spending six months on the Space Station, astronauts have aged approximately .005 seconds less than those of us here on Earth. Of course, this is a very insignificant amount of time, but it would be much more apparent if the astronauts were able to travel to closer to the speed of light. Interestingly, the effects of time dilation are fairly minor, even up to around 70% of the speed of light. However, once we reach 75% or so, the effects become dramatic. Now, bear with me here, because this is where things get a bit weird. Possibly the strangest aspect of special relativity is the distances shrink in the direction of motion. When we think of traveling to a point 10 light years away at 90% of light speed, you’d expect it to take 11 years, right? That’s not exactly the case. To a stationary observer, it would indeed
seem to take your vessel 11 years. But to the people inside the vessel,
not only time, but distance would dilate and you would reach that point in only 4.4 years. Want to play with time dilation yourself? I’ve added a link down below to a time dilation calculator. Okay, that’s all really fascinating, but is it really time travel? Perhaps not in the sense that we usually think of it, but according to the nature of
space-time, it is. If you were to return home from your 90% light speed trip, you would be almost 9 years older. But everyone back on Earth would have aged 22 years. So in essence, you’ve traveled 13 years into the future relative to your time in space. let’s look at another example. In the film Interstellar, Cooper and his team land on a large watery planet, on which gravity is 30% stronger than on Earth.
This planet is situated very close to a supermassive black hole called Gargantua, which it orbits at 55% of light. Gargantua’s mass is equal to that of 100,000,000 suns and spins at 99.8% the speed of light. The combination of all these factors have the effect of slowing down time relative to the astronaut left aboard the ship, by a staggering 61,000 times. That means that 1 hour on the planet is equal to seven years aboard the ship. When the team makes it back to the vessel after a little over three of their hours, their friend had aged by 23 years. The craziest part is that this isn’t just science fiction. Those calculations all check out. That’s exactly how it would happen in real life. So in essence, the crew had traveled 23 years into the future. Now so far, we’ve only explored traveling into the future. Is it possible to travel backwards in time? According to some theories, specific types of motion in space might allow time travel into the past and future, if these geometries and motions were possible. However, that’s a big if. It would require something called a closed timelike curve, or CTC for short. A CTC is a closed loop in space-time which could theoretically allow an object to return to its own past. The science behind time travel to the past,
is incredibly complex and speculative and many scientists suspect that it is not possible at all,
because of the issue of causality. That bring us back to the Grandfather Paradox, if in fact these scientists are correct and assuming traveling to the past would cause a paradox then we have our answer, time travel to the past is impossible. If however, the Novikov Self-Consistency Principle is correct, then there is still a chance. The Novikov Principle states that if an event exists that would cause a paradox or any change to the past whatsoever, then the probability of that event is zero. It would thus be impossible to create time paradoxes. Unfortunately, for any would-be time travelers, the Novikov Principle is not widely accepted. Another possibility would be the existence of wormholes, which are technically permitted by general relativity.
– In order to travel through time using a wormhole, it would have to be what is known as a
Transversable Wormhole. Brace yourself for more strange
space-time shenanigans here. In order to be able to travel through time using a Transversable Wormhole, its creation would have to be in one of two ways. Option one, one end of the wormhole would have to be accelerated to a significant portion of the speed of light, then brought back to the origin point. time dilation would result in an accelerated wormhole entrance aging less than the stationary one as seen by an external observer Option 2 requires one end of the wormhole to be placed within the gravitational field of an object with higher gravity than the other entrrance and then returned to a position near the other entrance This is a difficult concept to grasp So think of it this way, imagine you and I synchronize our watches to both display the year 2000 I hop in my ship and accelerate one entrance to the wormhole to near light speed and then bring it back My watch now reads 2004 And yours reads 2012 If someone were then to enter the accelerated entrance they would now exit the stationary entrance in the year 2004 the same location, but 8 years in their past It’s incredibly complicated stuff But an easier way to look at it is by picturing by a piece of paper This paper represent space time, a wormhole is an area of warped spacetime with an entrance and an exit which you can imagine as the paper being folded back on itself with a hole poked through it essentially you’re simply skipping all the time and distance between the two points The problem with transversable wormholes is that you can’t possibly travel back further than the initial creation of the wormhole So…really it’s more a path through time rather than a device propels itself back and forth through the years at will It could be useful for the people in the distant future wanting to come observe our time but if we created such a portal today we couldn’t use it to go visit the dinosaurs One final method that could potentially allow an individual to more or less travel through time is cryopreservation The branch of science concerned specifically with preserving human is called cryonics and the practice has been around since the late 1960s. Cryonics is on the speculative edge of medicine as its proponents suggest that Death is not a singular event, but a process it would have to be for the practice to be successful because it’s currently illegal for a human to be frozen before they die One a person opted to be cryo-preserved their bodies prepared minutes after official death the theory is that by reducing the patient’s body temperature to around -130 degrees celcius enough brain information will be retained in an accessible state for doctors and scientists of the far future to revive the patient temperatures of that low inevitably cause significant damage to the human body regardless of prior-preservation safeguards so the doctors of today are relying on the development of future technology that will allow the brain to be repaired at the molecular level and restored to functioning condition if someday technology has advanced far enough to revive cryo-preserved humans they will have essentially time traveled to the future it’s not quite as easy as shows like futurama make it seem but it is theoretically possible and that’s time travel in a nutshell you really can move forward through time by traveling at an immense speeds or through cryo-preservation But travel to the past is likely impossible of course the science of quantum physics and time travel is incredibly vast and well beyond the grasp of most normal people so we may be missing just one crucial element to understanding exactly how spacetime works but who knows? maybe someone from the far future will show up in our time and give us the key to unlocking the mystery or…would that cause a paradox as always, I’ve included sources and links for further reading in the description if you enjoy this video please take a moment to subscribe my channel your support helps me keep releasing two videos every week feel free to leave a like or dislike as you please and share your thoughts on time travel in the comments thanks for watching! And I’ll see you in the next video

100 Replies to “Is Time Travel Really Possible?

  1. Time travel is not possible 😞😞😞

  2. If someone from the far future tells us how to solve time travel, then that would certainly create a paradox. When that person gives us the key to time travel, we would have never solved it, we would just be copying down whatever they gave us. Then fast-toward to the future, the person who gave us the key to time travel never actually solved time-travel himself now, becuz it’s already solved. Because of this, the solution to time-travel does not have an origin point. It never actually happened…

  3. Imagine jumping through a portal and jumping through a second one beside eachother in a second but in the realm you wait for years

  4. I think if you're go to the past, then your future will be your past because you leave it behind, which means your past will be your future because you visit it, and it might be can create parallel universe and/or alternate reality because your presence, except if you can really time travel to the future with a time mechine – that will not only solve some problem above, but it also created a new problem because you'll disapper(swallowed by time? and space?) from where you start time travel – which means every system/things in the both past and future will be fuckedup because you messing up with God plan called "fate"(if you believe it, trust me you should).

    To be able to do time travel, we have to proof the existence of parallel universe and/or alternate reality, because we will need the formula from it to create a time mechine – which I think it means we will need a time mechine to proof it(as I explain above), because we have to create parallel universe and/or alternate reality with time travel that need a time mechine. So, yeah..pretty impossible for me.

  5. Ok let me explain this to the point of how both time travel forwards and backwards are possible.its already explained how you could travel forwards in time but it didn't exactly go into detail about the wave lengths required or used to travel that distance in that amount of time,and you need a ctc or loop to go back in time as a theory and if you think the ctc is used also to go towards,just think about a rollercoaster going forwards while also doing a loop,at different points in the loop your going to feel different things,and near the very top your going to almost feel weightless or non existent in the time frame and that's where you can go back in time,as if think of it this way an airplane going for a backflip then turning over half way threw and flying straight,now it would require alot of speed to get out of that pull of time from doing the loop,that's where the speed of light comes in,and also the risk,now once you get out of that loop IF you get out of that loop your now in time or space itself and you could possibly go anywhere but this is also where going backwards comes in play,since your facing back when you exit the loop you are going back in time and now think of a baseball player,trying to catch the ball,if you don't time it right you lose the ball so your going to need to time catching yourself in the time you want to go to, or finding another loop In time and once you catch onto the loop before hand you are now have traveled back in time,but what about going forwards again?here's the tricky thing,you need to somehow go back onto the loop as if going up on the backflip and go up then let go of the loop at the right moment to throw yourself back at the other loop,this is why it's not done because it's very dangerous and a small calculation could be devastating and of course if you catch it right your going to be back in present time,but also think of these loops as always moving or an infinite loop with a cart in it,and if you don't land in the cart your in the wrong time continuem now on back in time with the loop behind you once you catch it you need to figure out how to get out,now this is quite simple it's the same as if you were in space,and just copy and paste what your doing if your traveling towards in that is how you travel back in time and the funny thing is not one single person will look at this and take note if there large in the science community,not one person from nasa nor one person working on time travel,only the people who have read this will know and that's the sad thing

  6. So basically i go to that planet for an hour just to skip 23 years and still be 14 yrs old bc BODY wont age :think:

  7. I know how to manipulate the narrator to go back in time, although I cannot let him change the events.
    Just replay the video…

  8. Yes because somebody from another star system sees earth let’s say 100 years ago and that 100 years to the other system would take 100 light years to get to earth and as they go if they found a way to go speed of light it would be like that time went faster because they wouldn’t see earth 100 years ago when they come they would see now as present

  9. Technically we are looking into the past whenever we look at something that is millions of light-years away, if we look at a star that is 50 million light-years away then what we are seeing is 50 million years old, or 50 million years in the past. So if that star were to disappear then we wouldn't know for 50 million years.

  10. U do realize that if you time traveled to the past you wouldn't know only proof u have is your own mysterious thoughts about it.

  11. If you go to the past and caused an event that would prevent you from creating the machine do you think you would go back to the future with an alternate self that never time traveled or would you be erased from existence while the version of you that doesn’t time travel lives on etc etc

  12. Time travel to the past is not a paradox. You will see the past as u know it. In the grandfather paradox, when you are about to push your grandfather to a cliff, someone will shoot you or your grandfather will push you to the cliff in self defense. Your grandfather will have probably told you when you where a kid that a men tried to kill him for no apparent reason and that you killed him. That is possible. If you change anything in the past, you will have the ilusion that you have changed it. But before your time travel you can see that it happened in the past and nothing as changed because you really didn't "change" the past. The "past" was already there. You just did it.

  13. I will comment in a question format:
    Why can we send present events memories to our own selfs past dreams?? When we do it, we rest the time converting dreams into deja vu!!

  14. It really irritates me when people discard the laws of thermodynamics and the fact that our solar system travels in space.
    This type of video about grand father is so annoying!

  15. Time is an illusion and a complete result of you're universal perception, point in case when you're at the dentist walking through the door for some root canal treatment time slows right down but when you're out on Saturday night with nice chicks and getting high on drugs time just seems to fly by.

  16. i personally believe that you can time travel trough the use of magnetic fields since some pilot in thunderstorms have seen things that were later been built

  17. The 'endless loop' at the start is a logical contradiction, which disproves the hypothesis of travel back in time. End of story.

  18. Time is made to flow one direction going back you can change the future where in 2019 now go back to do something go to your timeline now you see a bunch of dead people with aliens and a flat surface just no house's no food complete flat like the moon

  19. Who remembers that time traveling turkey movie? With the turkey who received a special key that was given to him by the main protagonists. Just think, that keys been passed down for eternity. Because the time traveling turkey shows up talking about it, then protagonist turkey gets it somehow, goes back in time and gives it to time traveling turkey when he was a child. That means that key never had a beginning and probably doesn’t have an end 🤯

  20. Time travel backwards would violate entropy. Unless we can figure out how to reverse/negate entropy, time travel backwards is impossible.

  21. I solved the paradox theres no paradox because killing your grandfather wouldnt mean your whole family is dead they're still alive in the future nothing has changed you just killed him and thats it

  22. im gonna steal this from a tv show
    imagine this line ————-is time u went back in the time to kill your abusive dad but if u killed your dad u wouldnt be born cus ur parents wwouldnt have had sex so if they didnt have sex u wouldnt be born

  23. Yes, unfortunately – though I am not a subscriber/supporter to the idea. We are in software, so its trivial with a multitude of systems in offset stages of evolution to provide for time travel. So it IS going on now – the coloring used for implementation is basically a short-circuiting of a light path. You spin light around something then short the light circuit. Does it work? Probably not, but it doesn't matter – all you need, as usual, is the appropriate stage PROP style coloring to effect the necessary permissions. You can find the mostly true accounts from real time travelers here:

  24. its not really a paradox if you leave your time line to go back and kill him then when you return to your time life would just be like you never existed but because you already existed you when you leftyou would still be albe to go back and kill him

  25. But if you kill one of your ancestor from the past you will be stuck in the past forever.Kill your Gramdfather will be a bad idea 🤔

  26. Yes now with that said you can't just stand here on earth in 2343 July 32 (we added a day on every month cause the earth is on the edge of the Goldilocks zone and takes a little longer to get around the sun now….12 days actually) and poof back to earth Aug 17, 2019 (odd you use to write it like that).
    Why you ask? well as I said before the earth is on the edge of the "Goldilocks" zone so it is nowhere close to where it is for you. In fact Nov 5 1955 is nowhere close to where your earth is right now. Just think about it, Earth is not just sitting in one spot, so if you poof into that space/time point you'd be lucky if you just ended up in the middle of space and not next to a star. The planet rotates around the sun, the sun rotates around the black hole of the milky way, the milky way drifts through space away from the center of the universe.
    SO unless you can figure out where the earth was at the point you want to go then you better have a ship that can survive the darkest part of space, the hottest part of space, gravity proof from 0-1000 times that of earth, and able to travel great distances with great speed (like light speed would be best). Also lets say you are good enough to pinpoint earth at a certain time, how far from the surface are you willing to appear at? If you are just a common person able to do this at bare minimum money then you might not have the means to make a ship that you can poof in at space between earth and the moon. Just because you could do the math to appear 100 years back close enough to the earth to live you might not be good enough inter the earths atmosphere.
    Why would you not just appear in the exact space you left from? Well guess what, time/space/gravity is all relevant. You age yearly cause you live on the earth, the size of the earth dictates your "year" and how fast you age. People on the ISS age slower since they are not as close to the earth, if you could fly around the sun's surface (like close close) for 5 years then come back to earth you'd find that 50 years would have passed. Now with that said, in order to jump time you must remove yourself from time/space/gravity putting you in…..Limbo might be the easiest word for 2019 people to understand. So in limbo where there is nothing but you and your device that you time jumped with you are free to choose where you come back to but you were not carried along with earth since you had to remove all gravity to do so.
    FYI there is still gravity in space even if you are not near anything. It is the curl joke the universe plays on you, gravity and temperature is nearly impossible to escape. Take Rankine, absolute 0 temp scale for Fahrenheit (get over it the Metric system died on earth for my time 300 years ago). If you want to get to absolute 0 then the thing that you are cooling down to that must not touch anything that isn't also absolute 0. So the clamp that holds the object is touching the table that is touching the ground that is touching….. and unless you turn everything in the universe to 0 Rankine then your object is always touching something that is touching something that is…… and absolute zero is unreachable. Even touching the air counts.
    That and gravity is always touching something, after you are in limbo you are in absolute 0 for both but now you have become the source of gravity and temperature but luckily you are just touching yourself and nothing else is touching you so getting out of limbo is pretty easy. As for the science of getting there from here from there you need a black and white hole. Finding a natural black and white hole close enough together is pretty hard so you will have to make them but black holes are way easier to make than white holes and white holes are harder to find than black holes. Another joke the universe likes to play on you.
    BUT going back in time is 98% of the time pointless. You go back in time, you change the thing you wanted to, you go back to your time, nothing changed! Why? Well if you go back to change something then it changed before you went back to change it (leaving space/time/gravity) and you from the time that lived in the time of the changed timeline had no reason to go back in time to change the thing so you never went back to change it which means nothing changed. But when you stepped out of time/space it reset so you could return, otherwise you would just not exist cause you wouldn't have went back to change it in the first place so you would have not existed in that point of time.
    Look why time travel is pointless is very hard to grasp, just know that YOU now wanted money, so YOU now goes back in time to help YOU then win the largest lottery in history before that ass who wins it won it, the YOU then wins it so the YOU later (which is the YOU now) had no reason to go to the YOU then and help win the lottery. So when YOU now get back to your own time YOU then was never visited by YOU later cause YOU later had won the lottery as YOU then and never bothers to go back and see YOU then.
    OH if you made it this far and wonder why (or remember it being said) there is one day added to each month. We moved the earth to fight global warming.

  27. Unless, the guy you kill wasn’t your grandfather, bc your grandmother had lied about who got her pregnant. It should be the grandmother paradox(a man can’t never be 100% sure he is the father, as Maury will say)Plus, all that would happen will be you created a different timeline.

  28. What if humens die and they have a re life of an alien and us humens died and become a alien and that's why they are trying to come here

  29. People: Can you reverse the time ?
    Me: Of course.
    People: But how ?
    Me: { Inverting the sand clock} That's it.🤓😍😍😍😍😂😂😂😂😂😂😂

  30. This is my opinion:

    If you kill your pappy your not going to die too because when you time travel you did not travel on your own time you travel at different dimension in that dimension the things happening right now is not yet happening because its your pass so if you kill your grandfather in pass your not going to die but when you kill your grandfather in that time in that dimension your not going to get birth


  32. I don’t understand the “distances shrink in the direction of motion”… can anyone explain this in little more detail for me?

  33. would you go back in time to see the dinosaurs for 1 year however, trade off the rest of your life ; or keep it and never see the dinosaurs?

  34. I think I will build a time machine and go back in time and time travel to the past and remember everything including when I have my voice higher pitched before high school and when it changes dramatically deeper during puberty later 2 years ago my voice changed before when I was 12 and 13.

  35. short answer is yes;
    science proves that the closer you are to the speed of light the slower time moves.
    if you go beyond the speed of light you can travel backwards.
    however you cannot travel forward in time.

  36. So time is affected by gravity so that could mean that time isnt an ilushion but an object that has mass but for it to be affected by speed that could mean that its also affected by energy and if multiverses exist than time travel back in time is possible but it would create another universe exacly like ours so justi like a video being a reality.

  37. If your standing still counting to 3, or traveling at the speed of light counting to 3, its the same. time is man made

  38. If time travel is real we most likely would see something about it because the future already happened and rn we would technically be living in the past

  39. “We all have our time machines,. Those that take us back are memories…And those that carry us forward, are dreams.” ― H.G. Wells

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