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

Is EVERYTHING affected by gravity?

  1. Oct 5, 2011 #1
    Generalizing somewhat on my other post, I have to wonder -- if everything observable has an energy associated with it, then it is a form of mass as well, right? And all mass is affected (and causes) gravity, right? (And I don't mean rest mass -- I mean total mass.)

    Am I missing something stupid/obvious here?
  2. jcsd
  3. Oct 5, 2011 #2


    User Avatar
    Science Advisor

    The answer is yes. In the case of photons this was confirmed by the 1919 Eddington experiment.
  4. Oct 5, 2011 #3


    User Avatar
    Science Advisor
    Gold Member

    If one views gravity as a curvature in space-time then obviously everything which lives in space-time (i.e. everything) is affected by gravity. If this were not true, there would be a violation of the equivalence principle.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook