• The Galileo Project - Johannes Kepler [ Teens/Mature Teens ] - Illustrated essay includes a biography and chronological history of his work.
• Johannes Kepler - His Life, His Laws and Times [ Teens/Mature Teens ] - A short biography, a list of his discoveries and theories, and "Kepler's Laws of Planetary Motion".
• Johannes Kepler and his Laws of Planetary Motion [ Teens/Mature Teens ] - Biography and explanation of his laws from PhysicsPlanet.com.
• Kepler, Johannes [ Kids/Teens/Mature Teens ] - German astronomer Johannes Kepler was a supporter of the Copernican model of the universe. Find out more about his life and work.
• Kepler, Johannes [ Kids/Teens/Mature Teens ] - The son of a mercenary soldier and an innkeeper's daughter who later became a brilliant and prolific mathematician and astronomer, and creator of the Three Laws of Planetary Motion.
• MacTutor - Johannes Kepler [ Teens/Mature Teens ] - Biography provided by the University of St Andrews in Scotland. Includes a printable version and photographs.
• Wikipedia - Johannes Kepler [ Teens/Mature Teens ] - Illustrated encyclopedia article that covers the life and work of the German mathematician, astronomer and astrologer.

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