What is Vacuum Energy & How Does It Exist?

Alex48674
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Could someone please explain to me what vacuum energy is and how energy can exist in a vacuum. Sorry if this is the wrong forum, seemed as far as I know to fit best =]
 
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Very rough explanation:

It seems to be come from the wave functions of all the stuff in the universe. Specifically everything has a non zero (although extremely small) probability of being anywhere. The vacuum energy is the sum of all this stuff.
 

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