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Top 20 Directory:
Top : Science : Astronomy : History : Solar_System
See Also:
Sites:
  		• Asteroid Discovery Circumstances: For each minor planet: Where and when found, and by whom.
  		• Exploring the Moon: Timeline of Lunar exploration.
  		• 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
  		• Neptune's Discovery: Article in Astronomy Magazine.
  		• 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.
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