Why Time Travel to the Past is Impossible

Why Time Travel to the Past is Impossible


This video is made possible by Skillshare The first 500 people to click on the link in the description Will get their first 2 months completely for free So a few years ago Back in 2009 Steven Hawking decided to throw a party Near the Univeristy of Cambridge in the UK. The party happened on the 28th of June But the catch was that Hawking only sent out invitations To the party AFTER the party had already taken place You see, this was a party for time travellers And by only sending out invitations after the party had already taken place, The theory was that only people capable of time travel would know about it and show up. Unfortunately for Hawking, nobody ended up showing up to the party. At least to our knowledge He partied alone that day, but to any potential time travelers that are watching this video, You can change that by going to these coordinates on June 28th, 2009 and pay him a visit. Hawking believed that his invitations to this party would last for thousands of years. And hopefully encourage somebody in the far future to come back and visit But this automatically made a question Is traveling to the past even possible in the first place

100 thoughts on “Why Time Travel to the Past is Impossible

  1. If anybody in these comments is a time traveler and would like to prove me wrong, can you go back a couple days and bring me some lunch while I was editing this video? Thanks!

  2. no one says that paradoxses ar true I think that time work this way lets say that you went to the toilet for a minut ago then a minut later that means that you made your future I think that going and chancing the past works the same way and you never time travel before so you don't know have it works.

  3. Theoretically it is possible to time travel if you find a space-time continuum disruption, but then would you be able to choose where you go?

  4. my guess is that the novikov self-consistency principle is true
    look at it this way:
    someone's wish is to fly like a bird, but physics prevents that, so it doesn't really affect your free will. the same can be applied to the principle. physics don't allow you to interact with the past, the same as they don't allow you to fly like a bird

  5. All this talk about "the universe".
    People always personify "the universe", but never give credit to the One who invented the universe;
    Who is not bound by time, space, or matter (credit to Kent Hovind).

  6. Why does changing the past have to make sense? We have quantum atoms or something that makes literally no sense. they can be in 2 states at the same time or something. So technically if you go back in time to change stuff we might discover something that makes everything logical (but might not seem logical to us)

  7. What if time travel isn't really time travel but instead universe travel
    If we go back in time and kill Hitler it creates a fracture and therefore a new universe and timeline where hitler is dead, meanwhile our time still exists and doesnt change

  8. What if you can time travel to the past, but you’re invisible to them and can’t interact with anything, kind of like a ghost. Think of Charles Dickens’s A Christmas Carol when they see the past, present and future. Then in the future they would sell tickets to people for them to spectate the past lol.

  9. This is all well known . Ever seen the butterfly effect ?

    You can look but you can’t touch . You’re only proving that nothing can be altered .

  10. This sounds just like the Freelancers from the TV series Continuum, a secret organization to stop people from exploiting and corrupting the timeline. Though, isn’t there a theory that time isn’t linear? That even if we went back it wouldn’t change the future from that world but start a new branch? ??‍♂️

    My head hurts…

  11. I think about the two theories you mentioned a little differently. In the first, you can go back in time and do have free will to make choices, but the point is that you have already made those choices, so all the effects and consequences of them are already incorporated into the past as you understand it to be now. Try to change the past and you will just knowingly or unknowingly bring about the past you already know. This does have a free will problem though because since your actions already exist in your past, you could look yourself up in a history book, and at that point, what is stopping you from making choices different than the ones you read about you making? This is why I like the 2nd theory, but again, I see it a little different. It's not that you are traveling to another universe, so much as you are creating another universe by traveling there. The past you know doesn't have you in it, thus when you arrive, everything you do down to the blades of grass you step on, has been set on a new course just from you having arrived. The past you know still exists and can't be changed by your actions, but instead everything you do affects the future of this new timeline. The problem is that you can't go home again. Kill your grandfather and you will continue to exist, but no one will know you and you won't have an address or any bank accounts because in this timeline you were never born. From what I can tell this is the most consistent theory, it just requires branching time lines and multiple universes, but I think that exists anyway.

  12. Grandfather Paradox, Hitler Paradox, etc… Why does every would be time traveler want to kill someone? Why would I kill my own grandfather in the first place? What if, I time-traveled back in time, hit the lottery and live a life of luxury without killing someone? I don't think that traveling back in time would have an adverse effect on anything just as long as you don't hit major points. I mean just change your own life for the better, how about that? Any paradoxes with that?

  13. If the past is a place one might get to then that place in the past is so far away that no human could ever reach assuming one cannot travel faster than light. The whole universe is in motion and so is the Earth. Google it and stop talking about things that are not possible for humans. Sorry to be a killjoy but such is life.

  14. If going back to the past is possible and let say someone from the future visits us. Then it means we are living in a reality where everything we going to do has already been predetermined. Thats the implications of time travel.

  15. Infinite "Realities", many created due to "time travel". Rick & Morty got it right as to the result of time travel. "Unlimited time-lines"

  16. I wish time traveling existed, I really do. I would go back and leave this horrible world and live my days in peace. However, I don't think it is possible, simply because if time travel existed in the future, someone from that timeline would have already paid us a visit. The fact that no one from the future came back to our present time is enough evidence for me to say that it is impossible 🙁

  17. also, unless your time travelling device could also move you laterally through space, it wouldn't matter. The Earth is spinning and revolving around the sun, while the entire solar system is orbiting the black hole at the center of the Milky Way, which is also moving in some direction through space. If you went back in time even 10 minutes you would just end up floating around in space.

    If time travel did work as intended and you could stay on your current geographical location, then I like to think it would work similarly to how it does in the game "No One Has To Die"

  18. No alternate time lines are like train track. You still back up in time. Killing you grandfather just changes where the track goes

  19. I would only go back in time to get rich ?. I would gather valuable information and bring it to the future that I know is worth a lot of cheese ?

  20. Not only is travel to the past impossible…time travel to the future is also impossible. We only live in the now. Time travel is just a fun myth.

  21. read The End of Eternity from Asimov, they travel across all eras but they try to improve the general "wellness" of mankind

  22. What if people in the future can't go back to the past for fear of upsetting us or changing our reality, therefore time travel being outlawed?

  23. Time travel is, by its very definition, impossible. Because "time" is a human invention, based upon the movement of celestial objects, when measured against others. Example: A day on Earth only exists because the Earth's rotation lasts 24 hours, and humans decided it was a good thing for society to live by that standard. It wasn't until humans came along, however, that "days" actually existed in such terms of reckoning. Meaning that for millions of years, living things just went about their business without even thinking about time. There was day. There was night. There was eat, drink, sleep, breathe, and fuck. Leave it to humanity to complicate the simplicity of life a thousand magnitudes more than it needs to be…

    So RealLifeLore is, in fact, 100% correct. Time travel is impossible, simply because there is no "time." There is only the relentless forward progress of events, from the beginning of the universe's existence, until its' end. And if time even does exist in a higher "Fourth Dimension" of universal principle, as theorized by some, then accessing that Fourth Dimension, by Three-Dimensional beings like humanity, would also be impossible. We're not even certain that higher dimensions even exist, let alone how we would access them. We're still struggling with the simplistic act of leaving our pitiful little Solar System.

  24. What if you time travel to the past, destroy something there then return to your own present and that object is gone, shat is that paradox?

  25. Time traveling is not possible. Even if it was, it’s useless. Time traveling won’t change people, places, or things. The only thing it changes, is time. So if you go back in time to stop a murder, the murder would’ve still token place, you just made it an hour earlier. Simple.

  26. You're just like a toad in a well, just because you haven't seen something doesn't mean it does not exist, when even our standard model is flawed how can we predict (on the basis on a flawed theorem with 100% certanity) whether time travel is possible or not? Disliked.

  27. After watching the one about the travelling to the future I went on to watch this and I must admit,your ideas are really cool but it doesn't work like that

  28. But if you travel to the future, then you want to travel back to your timeline, that is technically the past since the future that you are now in is now the present.

  29. … I'd go back to 90s because the 90s (90s vibe lasted really up to '05) was the last decade to have decent (great) music.

    If I were to touch Hitler, the 90s as I know them would never exist and I wouldn't want that to happen. Hitler, you are safe by me lol

  30. I would go back in time and stop the invention of skillshare cause fark I am sick of them 'sponsoring' every video on youtube

  31. But if I don't kill my grandpa, then I do exist till I kill my grandpa. Everything up to the point of his death is still parallel to the reality of his existence???

  32. If you change time it would create a new timeline and you and anyone else involved with changing it would be from a different timeline then anyone else but no one else has the knowledge of if they didn't do the changing history.

  33. Time travel in the past is imposible..god or ei the creator of universe would not allow it. Lets say if you travel further back before the creation of universe, where.will you put yourself and your time machine, nothing is still yet created, neither space or time. Logicaly its imposible. If possible,.somehow it has limits.
    1. Do not change history, only observe it.
    2. Do not stay much as long as u might end up messing history and your original timeline.
    If you did not change anything but just observe it a couple of minutes or seconds,Its logicaly possible without paradoxes but has limits.

  34. My theory is that timeline is what it is today BECAUSE it has been altered by others

    Imagine caesar's assassination
    Imagine if brutus is a time traveller that came to kill caesar because he would otherwise had done something horrible
    This affects our timeline, but we cannot see it because in our reality, caesar was killed and therefore we don't know what would had happened otherwise

  35. did anyone ever think time travel is possible and they already changed the past and we are actually living the best possible timeline .. like maybe stopping the JFK assasination led to much worse things.. same with killing hitler.. and so on ..

  36. imagine accidentally going say, 100 years into the future, you would never be able to go back to the past where you previously were, you would never see your parents again, your siblings, your best friends, your cousins, everyone you know.

  37. I would go back to the night my mom and dad made me and just drive a car into the back of dad's pickup in the driveway. When he ran outside to see there would be nothing.. Lol.

  38. I would go back to the night my mom and dad made me and just drive a car into the back of dad's pickup in the driveway. When he ran outside to sed there would be nothing.. Lol.

  39. I wonder if, rather than sending physical matter into the past a la Back to the Future, Terminator, etc., it would be more feasible to send information or consciousness into the past a la Steins; Gate. We might run into the same time paradoxes but at least we would be able to conserve matter & energy. This might not even be too incredibly far-fetched, and it could even explain things like deja vu and prophecies, e.g. they're essentially "remembering the future".

  40. Wait a second if I went to the Future I could not go back to the past so I would be stuck in the Future, which would now be the present, so it wouldn’t be like as if I went to the Future since the Future would be the present.

  41. This video is retarded because how do you know if the present is the past of the future? If that's the case then time travel to the past is certainly possible.

  42. People believe that if they change the past, the existing present will disappear. That is impossible. The space is only affected by physical impact. However, if you assume that there are innumerable universes of different dimensions and different time zones, you can do something similar to time travel. Like Avengers.

  43. Remote viewers travel to the past and interact with people in the past there for time travel to the past is possible because it has already been done.

  44. My friend has this theory:
    If a time traveling machine ever gets made. Then you will only be able to go in the past after the time machine was made. Here is an example.

    A time travel machine is made in 2020, 20 years have passed so it’s 2040, right? And someone decides to go to the year 1980 but they can’t do it because the Time travel machine was never made during that time, which means your Past Travel limit is 2020 the date the Time travel machine was made

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