Space
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The Demotion of Pluto: A Defining Moment in Solar System Astronomy

Pluto demoted as planet: IAU 2006 General Assembly definition of a planet as celestial object large enough to have gravitational orbit & shoo away neighboring objects & debris.

The Demotion of Pluto: A Defining Moment in Solar System Astronomy

Pluto: A Mysterious World with Complex Features

A detailed exploration of the features and history of Pluto, including reclassification as dwarf planet.

Pluto: A Mysterious World with Complex Features
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