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Is time travel possible?

  1. Jun 10, 2013 #1
    Hey guys,
    Why you think time travel will be or wont be possible either now or in the future?
  2. jcsd
  3. Jun 10, 2013 #2
    "Time Travel" won't be possible, ever. Primarily because time does not really exist, only "now"... We perceive a "flow of time" only because we can "remember the past" in various ways, and because we can project our thoughts into (plan for) "the future."

    In a Universe where "time travel" is possible, every "now" that has ever happened (past or future) must already have happened, with each separate "now" forever existing in some strange "frozen" state, to which a "time traveler" could then presumably navigate back and forth...

    This (a completely predetermined and never-changing Universe, with no free will) should be enough to convince you that you can forget about "time travel"...
  4. Jun 10, 2013 #3


    Staff: Mentor

    D00dman, if you have a specific reference you would like to discuss then we can do that. But as you can see the question as posed is too broad and encourages unsupported personal speculation.

    The technical term for time travel that may be possible in general relativity is "closed timelike curves". You should be able to find a good reference.
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