The Struggles to Find the Ninth Planet
A paper by Clyde Tombaugh relating his discovery of Pluto.
Asteroid Discovery Circumstances
For each minor planet: Where and when found, and by whom.
Neptune and Pluto
Mathematical discovery of planets
Orbits and Gravitation
The development of the mathematics of planetary motion.
Neptune's Discovery
Article in Astronomy Magazine.
The Face of the Moon
A catalog for an exhibition of rare books and maps. Includes sample pictures from Galileo to the Apollo missions.
Exploring The Planets-Discovery
The five known in antiquity, three more since the telescope, and Ceres.
Exploring the Moon
Timeline of Lunar exploration.
The Planet Mars: A History of Observation and Discovery
On-line version of the book by William Sheehan.
Is Mars Habitable?
A. R. Wallace's 1907 critique of Lowell's Book "Mars and Its Canals"
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