Bibliography

Hawking, Stephen. On the Shoulders of Giants the Great Works of Physics and Astronomy.  Philadelphia: Running Press, 2002.

"Johannes Kepler: The Laws of Planetary Motion".  <http://csep10.phys.utk.edu/astr161/lect/history/kepler.html>

"Kepler's Supernova Remnant: NASA's Great Observatories Provide a Detailed View of Kepler's Supernova Remnant".  Harvard-Smithsonian Center for Astrophysics.
           Aug 30 2006.  <http://chandra.harvard.edu/photo/2004/kepler/>

Serway, Raymond, and John Jewett.  Physics for Scientists and Engineers 6th Ed.  Belmont: Brooks/Cole-Thomspon Learning, 2004.