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Alexander: About Energy

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Posted by Mike Banks on July 1, 2001 23:52:20 UTC

Taken from your other post:
"Because along with matter (mc^2), motion and radiation, you have GRAVITY - attracting each other pieces of matter and energy which are separated from each other, thus plenty of NEGATIVE potential energy. Careful calculation shows, that for flat Universe (i.e., when density = critical) both terms are EQUAL, so net energy of Universe is zero. Same with net momentum, angular momentum, charge, etc - it is all zero."

Please explain how anyone can know the net energy of the universe when the whole universe hasn't been explored/seen? This, to me, seems like an assumption that could be wrong. Please explain.

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