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

Energy come from other system

  1. Mar 24, 2005 #1
    my friend tell me that there is a energy input from unknown system to our system. it can prove by constantly expand of my universe. is he correct???
  2. jcsd
  3. Mar 24, 2005 #2


    User Avatar
    Staff Emeritus
    Gold Member
    Dearly Missed

    No. With a cosmological constant in Einstein's equation, expansion, and even accelerated expansion such as we see, is natural, an inner property of our spacetime. There is no reason to invoke an outside agency.
  4. Mar 26, 2005 #3
    Its the basic conservation of energy theorum: energy can not be distroyed nor created, but it can be converted. :smile:

    SelfAdjoint is also correct. There is another theorum another theorum that basically says matter can not be created or distroyed. So what we've got is all the matter we have.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook