This website, from the University of California, Berkeley, provides a description of the study of stellar motion around the center of a galaxy, and includes a graph of rotational speed versus distance from the center. The site relates this study to the prediction of dark matter. The page also gives explanations of other lines of evidence for dark matter.
%0 Electronic Source %A White, Martin %D August 20, 2007 %T Rotation Curves %V 2015 %N 29 May 2015 %8 August 20, 2007 %9 text/plain %U http://astro.berkeley.edu/~mwhite/darkmatter/rotcurve.html
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