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Is Mars Habitable? -
A. R. Wallace's 1907 critique of Lowell's Book "Mars and Its Canals"
http://www.wku.edu/~smithch/wallace/S730.htm When Did the asteroids Become Minor Planets? -
Discusses the discovery of the first asteroids, their designation as planets, and their reclassification.
http://aa.usno.navy.mil/faq/docs/minorplanets.php Orbits and Gravitation -
The development of the mathematics of planetary motion.
http://www-groups.dcs.st-and.ac.uk/~history/HistTopics/Orbits.html The Planet Mars: A History of Observation and Discovery -
On-line version of the book by William Sheehan.
http://www.uapress.arizona.edu/onlinebks/mars/contents.htm Exploring The Planets-Discovery -
The five known in antiquity, three more since the telescope, and Ceres.
http://www.nasm.si.edu/ceps/etp/discovery/etpdiscovery.html The Struggles to Find the Ninth Planet -
A paper by Clyde Tombaugh relating his discovery of Pluto.
http://pagesperso-orange.fr/olivier.granier/meca/vulga/pluton/pluton.htm Asteroid Discovery Circumstances -
For each minor planet: Where and when found, and by whom.
http://ssd.jpl.nasa.gov/dc_home.html Neptune and Pluto -
Mathematical discovery of planets
http://www-groups.dcs.st-and.ac.uk/~history/HistTopics/Neptune_and_Pluto.html
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