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  • Time paradoxes

    Anybody have a link with some good ones?

    My favorites:

    Grandmother paradox. Let's say you go back in time and kill your grandmother. Then you would cease to exist, but that would mean you couldn't have killed your grandmother. In that case, you would have been born and had the opportunity to go back and time and kill your grandmother. (etc)

    Twin paradox: Let's say there are two brothers. One sits on Earth (A), the other (B) goes on a rocket that travels at a significant portion of the speed of light. When B returns to the one on Earth, B would have lived according to B the same amount of time as A and would therefore be the same age. But because time would have appeared to slow down, one would be older than the other. But they lived according to themselves the same amount of time. So how could one be older?

    My physics class at school is fun
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  • #2
    The second isn't really a paradox. It all depends on your frame of reference. And you can't time travel so you can't create the paradox, although one would suspect you would actually create another universe/dimension the moment you time travel so there is no paradox since your original universe is gone and you exist independant of it.
    Matt
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    • #3
      right. there is no physical imprint of "time" because time all revolves areound speed of a specific mass, in our case, light.

      we only comprehend time as memories, or the time it takes light to reach a specific set of references.

      so there isn't, or ever will be, the possibility of time travel.

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      • #4
        Time is relative to speed of course. You don't realise it but when you are going along in a train or car or whatever, you are actually experiencing time in a different manner to those who are not travelling relative to yourself.
        Motorsport Forums

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        • #5
          do we (humans) know enough about time to conclude that stuff like the grandmother paradox can exist? that's basically an infinite loop in time. in order for the grandmother paradox to be possible time would need to be linear right? but what if time is multi-whatever? if you traveled back in time then you would have left your own time line in which case you would not be affected by the death of your grandmother.

          oh no i've gone cross-eyed

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          • #6
            Re: Time paradoxes

            Originally posted by filburt1
            Grandmother paradox. Let's say you go back in time and kill your grandmother. Then you would cease to exist, but that would mean you couldn't have killed your grandmother. In that case, you would have been born and had the opportunity to go back and time and kill your grandmother. (etc)
            Ah, but did you kill your grandmother before your mother was born?

            Don't you remember the family story about the strangly dressed person who murdered your grandmother just after your mother was born?

            I do.

            The answer to this must be in Star Trek somewhere.

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            • #7
              I think the paradox only exists in our own minds. Nobody even knows if time travel is possible. Without knowing that there's no way we can go about trying to guess at these "paradoxes".

              It's like someone trying to discuss the physics surrounding superman when he lifts a train with his pinky.
              Well, there it is.
              - Keeper of the Grove

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              • #8
                Actually, forwards time travel is already possible.

                Backwards time travel, in theory, can be possible by using black holes to distort the time-space fabric, which, accoring to Einstein's Theory of Relativity will affect how time works.

                Therefore, we can reasonably conclude that is two black holes were to be intertwined together, a person going in through one end will end up at the mouth of the other, in the same space, but back in time.


                ....or something like that....
                :)

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                • #9
                  I thought the theory of relativity has been quenched now that we know that light has mass?

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                  • #10
                    It's called "theory" for a reason.
                    Well, there it is.
                    - Keeper of the Grove

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                    • #11
                      Originally posted by heretic
                      I thought the theory of relativity has been quenched now that we know that light has mass?
                      No. Light does have mass, but it is not matter.

                      That brings us to the questions: what exactly is energy? What exactly is matter?

                      Heck, we may even ask: What exactly is gravity?

                      The answer is that we do not know. We have theorms and hypothesis that fit how 'gravity' works on earth. But do we know exactly what it is and how it works? No.

                      Same with energy. Do we know exactly how it is converted? Do we know exactly what it is made of? No. We just have theories for how we think they work.
                      :)

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                      • #12
                        Originally posted by eiSecure
                        Heck, we may even ask: What exactly is gravity?
                        The curvature of space-time.
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                        • #13
                          Light is a very peculiar thing. It is both a particle and a wave. It can exist in 2 simultaneous positions at the same time. It operates in both linear and quantum physics.

                          The truth is that the more we know, the more we realize what we do not know.
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                          • #14
                            Originally posted by eiSecure
                            No. Light does have mass, but it is not matter.

                            That brings us to the questions: what exactly is energy? What exactly is matter?

                            Heck, we may even ask: What exactly is gravity?

                            The answer is that we do not know. We have theorms and hypothesis that fit how 'gravity' works on earth. But do we know exactly what it is and how it works? No.

                            gravity is the attraction of the combined atoms of a mass to another given set of them, just like molecules attract.

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                            • #15
                              i learned that light does not have mass but exibits properties of a mass sometimes... like the fact that light can be "bent" by a black hole.

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