 Quote by Mike2
If mass were lighter in less dense surroundings, e.g. the edges of a galaxy, this would be the same as the gravitational constant of the universe being smaller and particles would orbit faster at the edges and explain the strange spin of galaxies, right?
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In a sense, you are assigning a preferred reference frame to gravitational force over distance. If this were true, it would be easily observed within the solar system [proportionately less gravity effects from more distant planets]. But it is not true. Were that the case, Pioneer and the Cassini probe would have been way off course [not to mention missions to the moon]. The same effect would be also be obvious in particle accelerators.