Is the universe a closed system?

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abomb365
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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.
 
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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.
 
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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