History Solar System
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Asteroid Discovery Circumstances - For each minor planet: Where and when found, and by whom.
Exploring The Planets-Discovery - The five known in antiquity, three more since the telescope, and Ceres.
Is Mars Habitable? - A. R. Wallace's 1907 critique of Lowell's Book "Mars and Its Canals"
Neptune and Pluto - Mathematical discovery of planets
Orbits and Gravitation - The development of the mathematics of planetary motion.
The Planet Mars: A History of Observation and Discovery - On-line version of the book by William Sheehan.
The Struggles to Find the Ninth Planet - A paper by Clyde Tombaugh relating his discovery of Pluto.
When Did the asteroids Become Minor Planets? - Discusses the discovery of the first asteroids, their designation as planets, and their reclassification. Help build the largest human-edited directory on the web.