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Time travel not possilbe anymore?

  1. Jul 25, 2011 #1
  2. jcsd
  3. Jul 25, 2011 #2

    Doc Al

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    Staff: Mentor

    Why do you think that article implies that travel to 'the future' is impossible?
     
  4. Jul 25, 2011 #3
    because it says
    at the top
     
  5. Jul 25, 2011 #4

    Doc Al

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    OK. :smile: But I don't see anything within the article relevant to that statement. Time travel is just as impossible as it's always been--nothing new has been revealed. It's just confirming what we've understood all along.
     
  6. Jul 25, 2011 #5
    So it isn't possible to travel into the future? Or "moving faster" than eveyrone else is now?
     
  7. Jul 25, 2011 #6
    Well, technically, by the definition of the phrase, we are all "time travellers".

    However, it is possible to travel into the future. If you speed up so that you approach the speed of light, the theory of relativity states that your time slows down relative to people on Earth. That means that, when you return to Earth, you will be in the "future".

    However, this is irreversable. Once you have travelled to the future, you cannot travel back, as this article concludes.

    If you read a little bit further into the article, you may have realised that it was referring to travelling back to time, so the statement "time travel is impossible" is a bit misleading.
     
  8. Jul 25, 2011 #7
    Aha!
     
  9. Jul 25, 2011 #8

    Drakkith

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    Yes, we are all traveling into the future at the same fate (more or less) here on Earth! Heading away at a very high velocity relative to the Earth, say 99% c, would slow your time down in relation to Earth so when you returned you would be ahead in time for us. But for you, you would never notice your own time ever being anything but normal.
     
  10. Jul 25, 2011 #9

    Drakkith

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    Staff: Mentor

    No, the effect of the expansion of the universe has no effect locally, as the rate of expansion is extremely small.
     
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