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Originally Posted by Grav
Simple reasoning says that this is because the observer is moving with that which we are trying to measure. This would produce null results regardless of which methods we are using.
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You are correct here Grav. This is the key, and is exactly what is being discussed in the Conservation of energy thread in Q&A, and was briefly introduced by Publius in the MOND thread.
Mr Cahill has identified and almostly correctly defined the 'background' gravitational field that is independent of the baryonic matter gravitational interactions of galaxies. Also, as I suggested in the MOND thread (which no one seemed to notice or take heed of), none of the DM or MOND like affects can be seen in the solar system (at least for the planets' orbits) because 'space', the aether, the background field, whatever you want to call it, was not affected/effected when the solar system was formed.
So, for a Michelson/Morley type experiment, it would have to be earth being compared to movement in the 'greater' (than our galaxy) background gravitational field.