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When one invikes the inverse square rule one finds on that basis gravitational influence is not all we expect it to be...we have established in this thread that a black hole has very little influence on its host gallaxy ... what gravitational influenece exists between us and m31 for example.... attraction does not seem to cut it but an over all pressure as I suggest via the flow of paricles all over offers an "external" influence which on large scales may not be subject to an inverse square rule.
alex
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