Retrieving "Keplers Third Law" from the archives

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1. Cold Dark Matter (cdm)

   Linked via "Kepler’s Third Law"

   Galactic Rotation Curves
   The most historically significant evidence involves the flat rotation curves of spiral galaxies. Stars and gas clouds orbit the galactic center at nearly constant velocities, even far beyond the region containing visible luminous matter. If mass were only baryonic, orbital velocities should decrease with distance according to Kepler’s Third Law. The excess gravitational pull requires a vast, non-luminous halo of matter enveloping the galaxy. Analysis suggests that for a…