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.
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.
Argues that no commonly-accepted category fits it better. Includes a proposed definition of planet, and a list of known objects meeting it. From Lowell Observatory astronomer Marc W. Buie.
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.
Outlines the history of the debate.
Science /
Astronomy /
Solar_System /
Kuiper_Belt
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