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Once upon a time,....& ....& ....
Thanks Bengt it's starting to get interesting
Mass Medium.[/url] Matter and mass.
Which conjectures that the change of refractive index caused by the presence of matter has exactly the same effect on the paths of light rays as the questionable warpage of space which in Einstein's theory is caused by the presence of matter. In this way, the tested mathematics of general relativity remains intact since space-time, though un-warped, looks exactly as if it is warped!