Thanks to the following five websites for the information that is used in this animation. http://www.wolaver.org/space/planetarynebulae.htm http://www.schoolsobservatory.org.uk/astro/stars/lifecycle http://www.telescope.org/pparc/res8.html http://cse.ssl.berkeley.edu/bmendez/ay10/2000/cycle/massive.html https://www.physicsforums.com/threads/length-of-the-life-of-a-red-supergiant.610337/ Thanks to the following website for their text to speech service http://www.fromtexttospeech.com/
