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The Universtiy of Texas 2013, 'Constellation Guide', Star Date, viewed 14 March 2013, http://stardate.org/nightsky/constellations
Nine Planets 2013, 'The Sun', The Sun, viewd 13 March 2013, http://nineplanets.org/sol.html
Freudenrich, C 2013, 'How Telescopes Work', HowStuffWorks, viewed 7 March 2013, http://science.howstuffworks.com/telescope1.htm
NASA 2013, 'Stars', NASA, viewed 9 March 2013, http://science.nasa.gov/astrophysics/focus-areas/how-do-stars-form-and-evolve/
KidsAstronomy.com 2013, 'Our Solar System', KidsAstonomy.com, viewed 7 March 2013, http://www.kidsastronomy.com/solar_system.htm
NASA 2013, 'Planets', NASA Science, viewed 15 March 2013, http://science.nasa.gov/planetary-science/