LINKS
Johannes Kepler - Wikipedia
Johannes Kepler - Stanford Encyclopedia of Philosophy
Johannes Kepler - The Galileo Project
Johannes Kepler - Encyclopædia Britannica
Johannes Kepler - Eric Weisstein's World of Science
Johannes Kepler: The Laws of Planetary Motion - University of Tennessee's Astronomy 161
NASA - Ames Research Center - Kepler: A search for habitable planets -- Johannes Kepler
Kepler's Discovery
