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On 2002-06-22 14:28, Richard J. Hanak wrote:
1.) I think that there can be no such a thing as a freely falling body.
2.) I think that there can be no such a thing as a freely falling reference frame.
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So the Moon orbiting the Earth is dependent on another force besides gravity? What would this force be? Note "dependent" in this sense means that if we could "magically" remove this unknown force, the Moon would no longer orbit the Earth.
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3.) I think that there can be no such a thing as the universe.
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This is purely a semantic argument to sidestep the issue. The question is simply "do you or do you not believe in the principle of relativity for non-gravitional physics?"
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However, if I correctly understand the thrust of your inquiry what follows is a more relevant response.
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Not quite. All modern theories of gravity, not just General Relativity, rest upon the three principles I listed in my previous post. It is fine to take issue with any or all of these postulates, but one needs to defend this position.
To the best of our measurement ablity, these postulates are true. (Between 8-11 significant figures, depending on the postulate.) If these postulates are true, space is curved. It may not curve the way Einstein said it would, but space is curved.