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  • Remote Sensing Tutorial: Cosmology. NASA.http://rst.gsfc.nasa.gov/Sect20/A5a.html
  • How much energy does the sun produce? Boston Globe. Sept. 5, 2005.http://www.boston.com/news/science/articles/2005/09/05/how_much_energy_does_the_sun_produce/
  • How old is the Sun? Berkeley.edu.http://ds9.ssl.berkeley.edu/solarweek/DISCUSSION/howold.html
  • The Sun's Energy Source. Montana.edu.http://solar.physics.montana.edu/YPOP/Spotlight/SunInfo/Core.html