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Is the universe a closed system?

  1. Sep 19, 2010 #1
    Would the conservation of mass apply to the universe? Sorry I looked for awhile for the answer to this question but I couldn't really find anything.
     
  2. jcsd
  3. Sep 19, 2010 #2
    Conservation of "mass" isn't a law. Conservation of energy is, and mass is a type of energy that is often (but not always conserved).

    Conservation of energy does apply to the whole universe.
     
  4. Sep 20, 2010 #3

    Chronos

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    It appears you are asking if the universe is a closed system. That is uncertain. It appears, however, that mass/energy is conserved in either case.
     
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