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Asteroid Discovery Circumstances (Popularity:  )
For each minor planet: Where and when found, and by whom.
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Orbits and Gravitation (Popularity: )
The development of the mathematics of planetary motion.
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Neptune and Pluto (Popularity: )
Mathematical discovery of planets
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Exploring The Planets-Discovery (Popularity: )
The five known in antiquity, three more since the telescope, and Ceres.
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Is Mars Habitable? (Popularity: )
A. R. Wallace's 1907 critique of Lowell's Book "Mars and Its Canals"
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The Struggles to Find the Ninth Planet (Popularity: )
A paper by Clyde Tombaugh relating his discovery of Pluto.
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