1. "The History of Astronomy." Oracle ThinkQuest Education Foundation. N.p., n.d. Web. 1 Dec 2011.
2. Huxley, Henry. "http://courses.science.fau.edu/~rjordan/bios/Galileo/Galileo_bio.htm."A brief biography of Galileo Galilei. Florida Atlantic University, n.d. Web. 1 Dec 2011. <http://courses.science.fau.edu/~rjordan/bios/Galileo/Galileo_bio.htm>.
3. Stefano Bianchetti/Corbus. Smithsonian.com. 2008. Painting. Science and Nature: Smithsonian.com
4. "Johannes Kepler: The Laws of Planetary Motion." Web. 1 Dec 2011. <http://csep10.phys.utk.edu/astr161/lect/history/kepler.html>
5. NASA. Kepler in orbit with transiting planet in background. N.d. Graphic. Cosmology Bus.<
6. Astronomy's Biggest Stars (Spaced Out: A Cosmic Scene). 2009. Video. YouTube.<http://www.youtube.com/watch?v=j8gNpyWjrtg&feature=player_embedded>.
7. Greatest Science Discoveris:Sun Center of Solar System . 2009. Graphic. Fried Post. <http://www.friedpost.com/sciencetech/greatest-science-discoveris-sun-center-of-universe-1926.html>.
8. Dave Giancaspro. Easier Star Gazing With The Sky Calendar From The Abrams Planetarium. 2010. Graphic. GeekDad.<
9. Anthony Aveni. Stairways to the Stars. N.d. Graphic. n.p.<http://www.astronomy.pomona.edu/archeo/britain/stonehenge/align.htm>.
10. Chichen Itza. 2011. Photograph. n.p. <http://traveling-piont.blogspot.com/2011/03/chichen-itza-in-mexico.html>.
11. N.S. Gill. Claudius Ptolemy of Alexandria (c. A.D. 90-168). N.d. Painting. Inventions and Discoveries of Ancient Greek Scientists.<http://ancienthistory.about.com/od/sciencemedicine/tp/042810GreekScientificInventions.01.htm>.
12. Robertson, E.F.. "Eratosthenes of Cyrene." . N.p., n.d. Web. 2 Dec 2011.<http://www.gap-system.org/~history/Biographies/Eratosthenes.html>.
13. Cain, Fraser. "Circumference of the Earth." Universe Today. (Mar 2 2009): n. page. Web. 2 Dec. 2011. <http://www.universetoday.com/26461/circumference-of-the-earth/>.
14. Van Helden, Al. "The Galileo Project." . N.p., 1995. Web. 2 Dec 2011. http://galileo.rice.edu/galileo.html.
15. "The Copernican Model of the Planetary System-The Heliocentric Model." Science and Technology Education Center. Tel-Aviv University, n.d. Web. 2 Dec 2011. <http://muse.tau.ac.il/museum/galileo/kc-muse.html>.
16. "Johannes Kepler: The Laws of Planetary Motion." . N.p., n.d. Web. 3 Dec 2011. <http://csep10.phys.utk.edu/astr161/lect/history/kepler.html>
17. "Kepler's Discovery: The Ellipse." Johannes Kepler and the Door to Science. N.p., 2007. Web. 3 Dec 2011. http://www.keplersdiscovery.com/Elipse.html.
18."Aristotle Biography." Space & Astronomy at About.com. Web. 03 Dec. 2011. http://space.about.com/od/astronomerbiographies/a/aristotlebio_3.htm.
19."Aristotle Portraits." Web. 03 Dec. 2011. <http://www.gap-system.org/~history/PictDisplay/Aristotle.html>.
20. "Ancient Astronomers of Chichen-Itza, Mexico."Ancient X. N.p., n.d. Web. 3 Dec 2011. <http://ancientx.com/nm/anmviewer.asp?a=88&z=1>.
21. Norris, Lacy. "Stonehenge." Brittania History. N.p., 1986. Web. 3 Dec 2011. <http://www.britannia.com/history/h7.html>.
25. "The Almagest1: I-V, in Great Books of the Western World." . Encyclopedia Brittanica, n.d. Web. 3 Dec 2011.
26. Galileo Galilei Wiki Page By Melanie Albert
27. Nicolaus Copernicus Wiki Page By Colleen Caragher
28. Stephen Hawking Wiki Page By Joe Rosas
29. "Big Bang Cosmology." NASA <http://map.gsfc.nasa.gov/universe/bb_theory.html>.
30. "Mission." Esa Space Science. N.p., 2009. Web. 3 Dec 2011. http://www.esa.int/esaSC/120398_index_0_m.html
31."Newton's Laws of Motion." NASA - Title... Web. 03 Dec. 2011. http://www.grc.nasa.gov/WWW/K-12/airplane/newton.html.
32. Isaac Newton Page by Kyle Mathis
33."Newton's Philosophiae Naturalis Principia Mathematica (Stanford Encyclopedia of Philosophy)." Stanford Encyclopedia of Philosophy. Web. 03 Dec. 2011.
34. "Tycho Brahe's System of Motion." Westward Daily Motion. Graphic. <http://home.honolulu.hawaii.edu/~pine/images/Fig5-6.htm>.
35. "Telescopes" Wiki Page.<http://fall11astronomy.providence.wikispaces.net/Telescopes>.
36. Johnston, Helen. "Modern Astronomy-Voyage to the Planets." Image. <http://www.physics.usyd.edu.au/~helenj/>.