Sites discussing whether Pluto should be properly considered a planet, a Kuiper Belt object, or some other form of Trans-Neptunian Object (TNO).
In 1999 the International Astronomical Union announced that it was premature to consider removing the "planet" label from Pluto, but as more TNOs are discovered, the debate may be re-opened. For example, a TNO larger than Pluto, 2003 UB313, was announced in 2005.
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- National Geographic News: Pluto: Planet or Comet? Discusses Pluto's similarity to other Kuiper Belt objects, and introduces a 5-way classification scheme for solar system objects to break down the lumping together of dissimilar planets.
- Gravity Rules: The Nature of Planethood Article discussing possible definitions that qualify objects, such as Pluto and Sedna in the Kuiper Belt, as being planets or not.
- Astronomer Upset at New Planet Proposal Washington Post article describes Michael Brown's disagreement with a proposal to expand the definition of a planet to include, among others, his own discovery.
- IAU Resolutions 5&6 The International Astronomical Union's definition of a planet in the Solar System and ruling on the classification of Pluto.
- Pluto Argues that Pluto is the most important Kuiper Belt object, not the least important planet, based on its orbit and other properties. From astronomer Dave Jewitt, who studies comets and other primitive solar system bodies.
- Is Pluto a Giant Comet? Discusses related discoveries and excerpts.
- What is a Planet Reviews newly-discovered objects that stretch the definition of the term, including massive superjupiters, free-floating planets, and other exoplanets. Suggests a definition based on the way an object is formed. From astronomer Gibor Basri.
- Much ado about Pluto News release from NASA affirming Pluto's planetary status.
- When Is a Planet Not a Planet? Articles discusses the debate whether Pluto should be included among the planets. [Atlantic Monthly]
- CBS News: Pluto: Planet Or Junk Snowball? Outlines the history of the debate.