Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Speed of light

  1. Apr 15, 2006 #1
    Just read about the advances on travelling at the speed of light. I have a problem about the whole "time travelling" theory. If (or maybe when) the human race can travel at a speed faster than time itself, how could we possibly go back in time? Surely going faster than time would mean that you would only go forward and not back in time?
    Perhaps we could travel slower than time. A negative speed would be much harder to obtain than a possitive speed surely.
    I know that you are the people to explain to me ( please be nice) about this.
  2. jcsd
  3. Apr 15, 2006 #2


    User Avatar
    Gold Member

    I'm not sure about the specifics, but time travel can occur within a kind of (closed)feedback (time)loop where backwards movement is possible.

    There is a book by Stephen Hawking called The Universe in a Nutshell where he discusses time travel. Very good read to gain a basic understanding about the difficulties about time travel.

    Last edited: Apr 15, 2006
  4. Apr 15, 2006 #3


    User Avatar
    Staff Emeritus
    Science Advisor

    OK, what did you read, and where? It sounds like you read something that was a bit garbled, because, for starters, you can't travel at the speed of light.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Speed of light
  1. The speed of light (Replies: 4)

  2. The speed of light (Replies: 7)

  3. Light speed (Replies: 5)

  4. Light speed (Replies: 8)

  5. Speed of light (Replies: 18)