IAU: Trans-Neptunian Object 2003 UB313
Re-announces formation of a working group to produce a formal definition of a planet, in conjunction with the announcement of this Trans-Neptunian object larger than Pluto, which w…
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 pl…
SciZone - Ontario Science Centre: Pluto: Planet or Not?
Brief nontechnical introduction to Pluto and similar objects such as Sedna and Quaoar, and a summary of the features that make Pluto different than the other planets. Includes a ca…
SPACE.com: Pluto's Planet Status Could be Jeopardized by Sedna Discovery
Discusses the ongoing debate over the definition of the term "planet", and suggests that if Pluto should be considered a planet, so should Sedna and similar bodies.
The Status of Pluto
Clarification from the International Astronomical Union on Pluto's planetary status.