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In what medium do light, energy, and matter exist?

  1. Sep 30, 2009 #1
    In what medium do light, energy, and matter exist?

    I'm wondering what medium, material, substance do light, energy, and matter exist in. I'm not saying that I neccesarily think there is one, but I am wondering what the theories are in relation to our universe.
    Do these three things exist in a medium like sound travels through air or fish live in water?

    Is there actually such a thing as absolute nothing?
     
  2. jcsd
  3. Sep 30, 2009 #2

    Dale

    Staff: Mentor

    I don't know why people get the idea that spacetime must either be a material or "nothing". Spacetime has geometric properties such as distances (intervals), angles, and curvature. It does not have material properties such as velocity or density.
     
  4. Sep 30, 2009 #3
    Well I figure some people don't know one way or another and might feel the need to ask those who do. I can't speak for people, but that is why I asked.
     
  5. Sep 30, 2009 #4

    Dale

    Staff: Mentor

    Fair enough. The point is that you only know what something is by the properties it has. In the case of spacetime it has the properties that I mentioned above.
     
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