for scene 5 of the video " Dark Matter: 'Discovered'" by Rolf Witzsche
here for a larger image
The effect of any central gravity is zero
When we deal with distances in the order of tens of thousands of light years, the effect of any central gravity is zero, no matter how massive the central gravity might be.
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Published by Cygni Communications Ltd.
North Vancouver, BC, Canada - (C) in public domain - producer Rolf A. F.