| 1. www.herald.com |
| 2. http://hesperia.gsfc.nasa.gov/sftheory/index.htm |
| 3. http://athena.wednet.edu/curric/space/solterr/sunaur.html |
| 4. http://www.geocities.com/SiliconValley/Peaks/6475/index2.htm |
| 5. The World Book Encyclopedia, 1987ed., Vol.So-Sz, "Sun." |