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Originally Posted by dcl
You said, "Gravity has a cause. If we knew the cause, ---" We DO know the cause. See my second paragraph above, starting with "Undidly:".
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Hmm. So you are saying that the cause of gravity is:
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Originally Posted by dcl
It is fully accounted for by the field equations of Einstein's general theory of relativity. The presence of massive bodies distorts spacetime in their vicinity in a manner described by solutions to the Einstein field equations. This distortion in turn distorts the world lines of other bodies in the vicinity of the body causing the distortion. For example, it causes the planets of the solar system to orbit the sun in approximately elliptical paths.
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I don't see the cause there. Accounting for the effect of gravity mathematically and describing it as a distortion of spacetime which distorts world lines leads to the question of what causes the distortion. If you are saying that the distortion is caused by the field equations then I'm sure you see the error in your thinking. Equations don't distort space-time.
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Also, you seem to think that compressing a three-dimensional object can make it two-dimensional. Not true. No matter how thin you make a sheet of paper, it's still three-dimensional. A valid example of a two-dimensional object is a shadow: It has no thickness at all.
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Sorry, I don't follow how from what I said you arrive at a me suggesting that compressing a three-dimensional object can make it two-dimensional?