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Paradox watch

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    If time travel were possible, would you be able to go back in time and kill your grandfather in order to prevent your own existence?
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    (Original post by Ralfskini)
    If time travel were possible, would you be able to go back in time and kill your grandfather in order to prevent your own existence?
    Reminds me of that film, Back to the Future...

    It's these kinds of paradoxes that show how bizarre and perhaps impossible the notion of time travel really is.
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    It will be something we will never know unless we try it out.
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    (Original post by Ralfskini)
    If time travel were possible, would you be able to go back in time and kill your grandfather in order to prevent your own existence?
    hmmm...I think so, yeah!
    But would that mean that as soon as you did it you would cease to exist??
    Would you die or just disappear???
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    no but u could beat him up and steal his wallet

    or yes if it was in another universe if you subscribe to that
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    (Original post by Ralfskini)
    If time travel were possible, would you be able to go back in time and kill your grandfather in order to prevent your own existence?
    Either the past is totally defined and nothing you do can change it, ie, you would fail time after time again in your mission (for example, your gun might not work).

    Or, when you kill your grandfather, you create a new quantum universe, where the your grandfather never existed and where you therefore never exist, but your original universe remians intact.
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    If you killed your grandfather, it would mean you never existed, which means you could never go back in time to kill your grandfather in the first place.
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    (Original post by Dude)
    If you killed your grandfather, it would mean you never existed, which means you could never go back in time to kill your grandfather in the first place.
    And my two theories above resolve this paradox.
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    (Original post by Ralfskini)
    If time travel were possible, would you be able to go back in time and kill your grandfather in order to prevent your own existence?
    Well, one form of time travel is possible. Traveling FORWARD in time.

    Whether you can kill your own grandfather or not depends on the nature of the time travel. Acourding to the multiple universe theory you might kill your grandfather, but that will only prevent your birth in that universe. The other universe (from which you came) goes on with you being born.

    An interesting implication of this theory would be that you could go back in time (say 5 minutes) and shake hand with yourself. Later, you could go back in time again , and shake hand with TWO coppies of yoruself. By repeating this process, hundreds of coppies of yoruself could be created.

    The perhaps most interesting argument against time travel being possible must be the perfectly legitimate question: If time travel is possible, then why have we not vitnessed any visit from the future ?
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    (Original post by Jonatan)
    why have we not vitnessed any visit from the future ?
    where i come from we call them loonies
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    (Original post by Jonatan)
    If time travel is possible, then why have we not vitnessed any visit from the future ?
    Either the human race didn't live long enough to travel back in time
    Or these time travellers are being discreet, so as to preserve their own universe
    Or no-one has arrived in our universe
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    (Original post by Tek)
    Either the human race didn't live long enough to travel back in time
    Or these time travellers are being discreet, so as to preserve their own universe
    Or no-one has arrived in our universe
    Theoretically speaking, it's probably impossible to travel back in time from when a time machine is invented. So if we invented a time machine next year, we could only travel back to 2004 CE.
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    thats something my physics teacher taught me. we know that time travel can not work yet because we haven't had any visits from the future.

    you could kill your grandfather and still exist. you do a futuramia. fry killed his grandfather and still contiuned to exist (figure it out if u haven't seen the episode)
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    (Original post by Dude)
    thats something my physics teacher taught me. we know that time travel can not work yet because we haven't had any visits from the future.
    Well your Physics teacher is wrong -

    Or these time travellers are being discreet, so as to preserve their own universe
    Or no-one has arrived in our universe
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    Perhaps dejavu is evidence that the future has already happened and is being relived. Or perhaps not. I don't believe in time travel.
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    (Original post by Ralfskini)
    Perhaps dejavu is evidence that the future has already happened and is being relived. Or perhaps not. I don't believe in time travel.
    if u don't believe in time travel why start a thread about it.
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    (Original post by Dude)
    if u don't believe in time travel why start a thread about it.
    Do I even need to answer this question?
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    taken from an interview with Bob Gale, co-writer of Back To The Future :-



    Q: Doc says that if Jennifer sees her older self it could create a time paradox that might destroy the universe. Please explain.


    A: First of all, let's define TIME PARADOX. A Time Paradox is a situation in which the effect of an incident contradicts or eliminates the cause of that same incident. As an example, imagine that in 1990, 40 year old John Smith goes back in time 30 years and finds his younger self, aged 10, in 1960. Suppose 40 year old Smith pulled a gun and murdered his 10 year old self. Then 10 year old Smith would never grow up to become the 40 year old Smith. How then could 40 year old Smith go back in time to murder "himself'? Thus, the effect of the incident (the murder of 10 year old Smith) eliminated the cause (the existence of the murderer). A paradox, by definition, is impossible. In the case of Jennifer, the shock of seeing herself old causes her to faint. But what if young Jennifer had hit her head on a cement stair, suffered brain damage and died? Then, she would never grow up to marry Marty, they would never have kids, and Doc would never have had reason to bring them to the future in the first place. And if Jennifer never goes to the future, how can she die in the future? (Also, in Back to the Future, if Marty had actually been erased from existence by never having been born, he would have never existed to grow up, go back in time, and interfere with George being hit by the car!) For the record, many scientists use the time paradox concept as an argument as to why time travel has to be impossible. Since time travel allows possibility of a paradox, and since a paradox is impossible, time travel itself must be impossible. However, in the Back to the Future films, time travel DOES exist. Thus, Doc Brown surmises that if a paradox were indeed to occur, the result could be cataclysm of some sort. On the other hand, since a time paradox never truly does take place in the films, it could mean that there's some sort of "self preservation" mechanism in the cosmos which prevents a paradox from ever happening. Perhaps then, this is the reason that both Jennifers faint -- to prevent a potential paradox!
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    wow, you've really gone all out here.

    what do u think about you can never touch your younger/older self. meaning if u went back in time to tell your younger self something, and touched him/her on the sholder, something would happen that would destroy the universe. cos it is impossible for that to happen.
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    (Original post by Jonatan)
    The perhaps most interesting argument against time travel being possible must be the perfectly legitimate question: If time travel is possible, then why have we not vitnessed any visit from the future ?
    There's a claim that the future has already sent somebody back in time. I read that a man has been witnessed several times in the UK between 1700's-early 1900's, always the same description, in very futuristic-looking clothes, and using precious stones etc. as currency. He predicted accurately what would happen in the future and apparently helped to create train travel and participated in other key events during the Industrial Revolution, without which we wouldn't be as technologically advanced as we are now. He could describe biblical events down to the tiniest details as he said he had witnessed them through time-travel (such as the water into wine wedding), and though there was a lot of scepticism, the man would have been about 160 years at the time of his last sighting.
    I feel that if the future was to send a time-traveller back in time then they wouldn't make themselves obvious, or it might change time for the worse. And wasn't it Einstein who believed that time-travel is theoretically possible by the manipulation of wormholes in space? We're only just beginning to investigate them so time-travel might not be too inconceivable an idea in the future.
 
 
 
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