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Move one, How long does it take for another one to move?

  1. Mar 2, 2010 #1
    Hi,all, problem:

    2 stars, distance is 1 lightyear.

    If I move one star, will the other star move 1 year later?

    Basically, I want expose the problem that, how fast does a field travel.

    Thanks In advance!
     
  2. jcsd
  3. Mar 2, 2010 #2

    PhanthomJay

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    Are you inquiring about the speed of the propagation of gravity? As far as I know, this is still undertermined. You might find all sorts of answers, from infinite, to 10 times the speed of light, etc.; but I believe the most widely accepted theory at this point in time says that it travels at the speed of light. I will ask the moderators to move this post to the special/general relativity section, if it belongs there.
     
  4. Mar 3, 2010 #3
    Thanks for replay. I am wondering, is the speed of information(field) travel at the speed of light, then about wavefunction sperad all over the space? refer to my another question, see:

    https://www.physicsforums.com/showthread.php?t=383108

    Thanks a lot!
     
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