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2. "Planetary Photojournal." Jet Propulsion Laboratory: California Institute of Technology. NASA. 19 Jun 2007 http://photojournal.jpl.nasa.gov/index.html>.
3. Newman, Phil. "The Sun - Introduction." Goddard Space Flight Center. 06 September 2006. NASA. 12 Jun 2007 http://imagine.gsfc.nasa.gov/docs/science/know_l1/sun.html>.
4. Kaufmann, William, and Roger Freedman. Universe. 5th ed. New York: W. H. Freeman and Company, 1999, 422.
5. Arnett, William. "The Nine Planets: A Multimedia Tour of the Solar System: one star, eight planets, and more...." The Nine Planets Solar System Tour. 25-08-2006. 28 Mar 2007 http://www.nineplanets.org/>.
6. Critchton, Dan. "Welcome to the Planets." Jet Propulsion Laboratory. 10-05-2005. Jet Propulsion Laboratory of the California Institute of Technology. 28 Mar 2007 http://pds.jpl.nasa.gov/planets/welcome.htm>.
7. "Exploring the Planets." Smithsonian National Air and Space Museum. National Air and Space Museum. 28 Mar 2007 http://www.nasm.si.edu/etp/>.
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9. "Solar System Information #14: Planets." Welcome to the Perth Observatory. 27-09-2006. Perth Observatory. 28 Mar 2007 http://www.perthobservatory.wa.gov.au/information/planet_defn.html>.
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11. Martin, David. "What Defines a Planet?." NASA's Solar System Exploration: Planets: Dwarf Planets. 14 September 2006. NASA. 14 Jun 2007 http://solarsystem.nasa.gov/planets/profile.cfm?Object=Dwarf&Display=Facts>.
12. "Definitions from Dictionary.com." Dictionary.com. 2007. Lexico Publishing Group, LLC. 12 Jun 2007 http://dictionary.reference.com/browse/basaltic>.
13. Ibid. http://dictionary.reference.com/browse/anorthositic>.
14. Kaufmann, William, and Roger Freedman. Universe. 5th ed. New York: W. H. Freeman and Company, 1999, 244.
15. Ibid. 250-252.
16. "Mercury Statistics." Windows to the Universe. 05 March 2003. University Corporation for Atmospheric Research (UCAR). 14 Jun 2007 http://www.windows.ucar.edu/tour/link=/mercury/statistics.html>.
17. Kaufmann, William, and Roger Freedman. Universe. 5th ed. New York: W. H. Freeman and Company, 1999, 259.
18. Ibid. 265.
19. Ibid. 262.
20. Ibid. 265-267.
21. "The Gateway to Astronaut Photography of Earth." Image Science and Analysis Laboratory. 19 June 1997. NASA-Johnson Space Center. 19 Jun 2007 http://earth.jsc.nasa.gov/scripts/sseop/PhotoIdSets/PhotoIdSets.pl?set=EarthDisc>.
22. Kaufmann, William, and Roger Freedman. Universe. 5th ed. New York: W. H. Freeman and Company, 1999, 192 & 204.
23. Ibid. 281.
24. Ibid. 286-287.
25. Ibid. 293.
26. Ibid. 291-298.
27. Ibid. 303.
28. Ibid. 307.
29. Ibid. 313.
30. Ibid. 307-308.
31. Ibid. 347-349.
32. Ibid. 355.
33. "Cassini-Huygens Home." Jet Propulsion Laboratory: California Institute of Technology. 13 June 2007. NASA. 14 Jun 2007 http://saturn.jpl.nasa.gov/home/index.cfm>.
34. Kaufmann, William, and Roger Freedman. Universe. 5th ed. New York: W. H. Freeman and Company, 1999, 368-371.
35. Ibid. 376.
36. Ibid. 370 & 375.
37. Ibid. 373-377.
38. Ibid. 383.
39. "New Horizons Web Site." New Horizons: NASA's Pluto-Kuiper Belt Mission. 14 June 2007. NASA. 14 Jun 2007 http://pluto.jhuapl.edu/>.
40. "Observations reveal curiosities on the surface of asteroid Ceres." Solar System Exploration. NASA. 21 Jun 2007 http://www.swri.org/press/ceres.htm>.
41. "Ceres (dwarf planet)." Wikipedia: The Free Encyclopedia. 13 June 2007. Wikipedia. 14 Jun 2007 http://en.wikipedia.org/wiki/Ceres_(dwarf_planet)>.
42. "Ceres." Answer.com. 2007. Answers Corporation. 14 Jun 2007 http://www.answers.com/topic/ceres>.
43. "Dwarf Planets: What Defines a Planet?." Solar System Exploration. 14 September 2006. NASA. 14 Jun 2007 http://solarsystem.nasa.gov/planets/profile.cfm?Object=Dwarf&Display=OverviewLong>.
44. Nemiroff, Robert. "Astronomy Picture of the Day." Astronomy Picture of the Day Archive. 18 September 2006. NASA. 22 Jun 2007 http://apod.gsfc.nasa.gov/apod/ap060918.html>.
45. "Eris (dwarf planet)." Wikipedia: The Free Encyclopedia. 14 June 2007. Wikipedia. 14 Jun 2007 http://en.wikipedia.org/wiki/Eris_(dwarf_planet)>.
46. Watanabe, Susan. "Hotly-Debated Solar System Object Gets a Name." National Aeronautics and Space Administration. 14 September 2006. NASA. 14 Jun 2007 http://www.nasa.gov/vision/universe/solarsystem/erisf-20060914.html>.
47. "Eris." Answer.com. 2007. Answers Corporation. 14 Jun 2007 http://www.answers.com/topic/eris-dwarf-planet>.
48. "Tools of Exploration." Exploring The Planets. 2002. National Air and Space Museum. 15 Jun 2007 http://www.nasm.si.edu/research/ceps/etp/tools/etptools.html>.
49. Kaufmann, William, and Roger Freedman. Universe. 5th ed. New York: W. H. Freeman and Company, 1999, 252.
50. Ibid. 291.
51. "Voyager 1: Beyond Our Solar System." Solar System Exploration. 25 September 2003. NASA. 15 Jun 2007 http://solarsystem.nasa.gov/missions/profile.cfm?Sort=Alpha&Letter=V&Alias=Voyager%201>.
52. "Voyager Mission to the Outer Planets." NASA Facts. NASA: Jet Propulsion Laboratory: California Institute of Technology. 16 Jun 2007 http://www.jpl.nasa.gov/news/fact_sheets/voyager.pdf>.