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"Chandra :: Educational Materials :: Stellar Evolution." Chandra :: Educational Materials :: Stellar Evolution. N.p., n.d. Web. 28 Feb. 2014. <http://chandra.harvard.edu/edu/formal/stellar_ev/>.
"Hertzsprung-Russell Diagram." Hertzsprung-Russell Diagram. N.p., n.d. Web. 28 Feb. 2014. <http://zebu.uoregon.edu/~soper/Stars/hrdiagram.html>.
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"HR Diagram." HR Diagram. N.p., n.d. Web. 28 Feb. 2014. <http://abyss.uoregon.edu/~js/ast122/lectures/lec11.html>.
"The Life Cycle Of A Star." The Life Cycle Of A Star. N.p., n.d. Web. 27 Feb. 2014. <http://www.telescope.org/pparc/res8.html>.
"Life Cycle of a Star." Life Cycle of a Star. N.p., n.d. Web. 28 Feb. 2014. <http://aspire.cosmic-ray.org/Labs/StarLife/starlife_main.html>.
"The Life of a Star." The Life of a Star. N.p., n.d. Web. 27 Feb. 2014. <http://www.astro.keele.ac.uk/workx/starlife/StarpageS_26M.html>.