- 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.
