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Thread: Time Travel

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    F CK all I need is U ilikeitlikethat's Avatar
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    Default Time Travel







    Time Travel.

    The science and phsysics of.

    What are your thoughts on Time Travel?

    Time Travel, going forward and going back both have theories of how that can happen, but they are two different sciences.
    To travel forward, you go really really fast (speed of light and stuff).
    To travel back, so they say, you'd have to twist/fold space on to it's self.

    Paradoxes and stuff too.

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    right on the left wing Philosorapteuse's Avatar
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    I've yet to meet a theory of time that I found coherent with time travel, sadly. But it is a fun thought-experiment. Lots of interesting questions about causality and identity.
    "A great many people think they are thinking when they are merely rearranging their prejudices." --William James

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    I am fascinated by the idea of retrocausality. It is the idea that objects in the future can affect the present or the past and that the present can affect the past.

    http://en.m.wikipedia.org/wiki/Retrocausality

    In fact a very interesting cat named John Cramer proposed an experiment in 2007 to measure non-local time symmetries using entangled photons.

    http://nextbigfuture.com/2009/09/joh...ments.html?m=1

    It is quite an interesting topic.

    Then of course the arrow of time is not necessary in an understanding of modern physics

    http://preposterousuniverse.com/eternitytohere/faq.html

    Yet is still perceived by our conscious mind. Quite fascinating indeed.

    I will try to find once more two articles I read:

    1 was explaining hidden time symmetries in obscure quantum equations. The second about the potential for a future civilization to reset time in the face of extinction to allow probability another go at a different outcome.

    Edit:

    Also of note:

    The Einstein–Podolsky–Rosen paradox
    For all that we have done, as a civilization, as individuals, the universe is not stable, and nor is any single thing within it. Stars consume themselves, the universe itself rushes apart, and we ourselves are composed of matter in constant flux. Colonies of cells in temporary alliance, replicating and decaying and housed within, an incandescent cloud of electrical impulses. This is reality, this is self knowledge, and the perception of it will, of course, make you dizzy.

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    If you travel back in time and kill yourself, theoretically you have created a parallel universe.

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    Senior Member Winds of Thor's Avatar
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    Maybe if it can be established, a baseline of understanding of particles faster than light, perhaps neutrinos, for example, and understanding their relationship also to space... that baseline understanding could lead to some invention that might enable man to change his place in time.

    Some inspiration: http://www.guardian.co.uk/science/20...cles-neutrinos

    Because if you understand something faster than light, and you also understand something slower than light, maybe the same thing just in a different form...then how time is seen might be changeable using the new substance as an exterior form.

    Sorry, I know it sounds way out there. Blah
    "..And the eight and final rule: If this is your first time at Fight Club, you have to fight."
    'Men are meant to be with women. The rest is perversion and mental illness.'

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    Travelling into the past will prove to be impossible, i think. Once particles have taken their course there are no "do-overs".

    Like everyone knows though, the future is where it's at...

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    Senior Member INTP's Avatar
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    first of all, we need to define time. in my opinion(feel free to debunk if you can), time is only an concept created by men, measuring how fast something moves in space. in order to go back in time, you would need to move backwards in a space where something that has already happened hasent happened yet. now when it comes to this, we need to look at how space expands. my INTJ friend has a good theory about this, basically photons are always still in space, but space expands, creating an illusion of photons traveling in space, when in fact its the space that expands in the rate of photons. so in order to move back in time, we would need to move faster than photons, which according to laws of physics as we know today is impossible. even if we could move faster than photons(move back in time), it would require us to move in space, away from the place where we want to move in time backwards, sort of escaping from the photons than we previously observed. but then there is another problem, if we move away from earth(lets say we want to move backwards in time of the earth), we would have to go FAAAAAAR away from earth faster than light, just to observe the photons that has been projected by something in earth earlier. but then there is another problem, we can only observe time that has already happened on earth(just like we are observing distant stars and galaxies). in order to overcome this, we would need to move towards earth faster than light again, which would enable us to move back in time. but there are problems in this also(besides it being impossible to move faster than light), when we do move at high speeds in space, we would bump into hydrogen atoms in space(space has around 1 hydrogen atom per square meter), which at high speeds like this would penetrate the what ever we are traveling in and us, causing death.


    Quote Originally Posted by Avatar7 View Post
    this has been debunked, just like i suspected when this was released, they didnt take measuring error in electricity slowing down in mass amount of electric circuits into account.
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    Quote Originally Posted by jontherobot View Post
    Travelling into the past will prove to be impossible, i think. Once particles have taken their course there are no "do-overs".

    Like everyone knows though, the future is where it's at...
    NO NO NO.

    I want to go to the past. Why couldn't we go to the past? It already happened. It's out there, somewhere.

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    Senior Member Winds of Thor's Avatar
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    Quote Originally Posted by INTP View Post
    this has been debunked, just like i suspected when this was released, they didnt take measuring error in electricity slowing down in mass amount of electric circuits into account.
    Ahh ok..someone's probably gone back to the drawing board.
    "..And the eight and final rule: If this is your first time at Fight Club, you have to fight."
    'Men are meant to be with women. The rest is perversion and mental illness.'

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    Quote Originally Posted by Marmie Dearest View Post
    NO NO NO.

    I want to go to the past. Why couldn't we go to the past? It already happened. It's out there, somewhere.

    You could go into the future so far we've mastered space travel so well you can visit so many planets until you find one that satisfies the conditions of a "past Earth". But you can't go to past Earth. Sorry Marm =(

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