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

B Very simple question about GR

  1. Oct 17, 2016 #1
    Relativity say as an an object accelerates, time dilates and distances contract.

    It is my understanding that the shortest distance possible is a planck length, so as distance contracts, does the number of planck lengths decrease, or does a Planck length get shorter? It would seem the former, but I don't know. I've got only a pop sci education

    Is there a simple answer?
     
  2. jcsd
  3. Oct 17, 2016 #2

    PeterDonis

    User Avatar
    2016 Award

    Staff: Mentor

    Not in GR. In GR there is no shortest possible distance. The idea that the Planck length is the shortest possible distance comes from speculations about quantum gravity.

    In GR, an object that is one Planck length long in its rest frame will appear shorter than one Planck length in a frame in which it is moving.
     
  4. Oct 17, 2016 #3

    Nugatory

    User Avatar

    Staff: Mentor

  5. Oct 18, 2016 #4
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Very simple question about GR
  1. Question about GR (Replies: 6)

  2. Simple GR Question (Replies: 10)

Loading...