Works Cited
http://en.wikipedia.org/wiki/Hertzsprung–Russell_diagram
http://www.teachastronomy.com/astropedia/article/Universal-Expansion
Chris Empey
http://space.about.com/od/stars/tp/What-Are-The-Different-Types-Of-Stars.htm
John P. Millis, Ph.D.
http://docs.kde.org/stable/en/kdeedu/kstars/ai-colorandtemp.html
Jasem Mutlaq
http://www.teachastronomy.com/astropedia/article/Universal-Expansion
Chris Empey
http://space.about.com/od/stars/tp/What-Are-The-Different-Types-Of-Stars.htm
John P. Millis, Ph.D.
http://docs.kde.org/stable/en/kdeedu/kstars/ai-colorandtemp.html
Jasem Mutlaq