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Thanks Rob and Steven for your consideration and comment.
I understand the matters relating to orbit speed etc... my selection of a grain of sand was to have an object that would take little to move... so if the bh can influence something lets try a grain of sand... I would have thought the black hole would be massive beyond reasonable limits if we are to conclude it can influence all the gallaxy via gravity... as to a pass on effect from star to star ...yes interesting but I feel such a system would not hold a galaxy together..but then I am pushing the exterior force idea so I will be careful and think longer about such a system.
Steven all I am pointing to as to the message of gravity escaping a black hole is simple... our sums tell us nothing can escape yet it must..at least the mythical graviton I would reason is/if created and must travel to other parts of the Universe to get the message of gravity to another object... well if the gravity is so strong one could expect that not even a particle can leave...be it a photon or a graviton... the bh sums say they can not leave .... mind you I dont believe in the graviton as it no doubt works via attraction and as you know I say attraction is a mythical force which does not function in reality...gravity works via push I feel and in that case nothing need leave the black hole to communicate gravity as the gravity comes from the exterior a pressure is a way of looking at it I guess... so we dont have any messaging problems as I raised for an attraction system... sorry folks I have tried to give it (push gravity) up but here it comes again...I am sick of it so I appreciate all of you must feel similar...thanks for the well considered comments.
alex
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