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Posted by Joseph Roser on March 22, 2001 20:48:54 UTC

If we can make brick out of gravitational potential, the energy difference between two points in a gravity field, then where is the brick actually coming from? What is the ultimate source? Spacetime itself? How many other ways are there known to take this energy difference in a gravity field and make it real anywhere in the universe? What is depleted after the energy is taken from the gravity field if the gravitating body changed in no way? Help!

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