Transcript for scene 28 of the video " Kepler Today - Part 1 - The Science Revolution" by Rolf Witzsche - Ice Age Ahead not Global Warming  

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A third set of epicycles dark matter

And since this isn't quite sufficient to explain the gravitational hold on a distant star, a third set of epicycles has been invented, which is imagined as a ring of dark matter strung around the perimeter of the galaxy as a type of external attractor, that is of course invisible too.



 

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Published by Cygni Communications Ltd. North Vancouver, BC, Canada - (C) in public domain - producer Rolf A. F. Witzsche