Originally posted by gravityblock
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we get 9.8(6378000 / 77,875,
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I apologize for that but this forum
. So the material itself need not have substance to have mass. All that is needed is a property to displace space and keep it outside of the interior. Imagine an air bubble forms in the ocean bottom and displaces the water around it. Now imagine the surface of the bubble is frozen solid and the interior evacuated and you have a close approximation of a 2d surface enclosing a 3D sphere with nothing in the middle.
which is an Elliptic Operator .
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