Hertzsprung-Russell Diagram.
Editor’s Note: This guest post was written by Markus Pössel, a theoretical physicist turned astronomical outreach scientist. He is the managing scientist at the Centre for Astronomy Education and Outreach “Haus der Astronomie” in Heidelberg, Germany.
by NANCY ATKINSON on MAY 9, 2013
Read more: http://www.universetoday.com/102035/this-diagram-is-better-than-183487-images/#ixzz2SvKTJL5c
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