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California Institute of Technology
The Discovery of Eris, the Largest Known Dwarf Planet
Until the discovery of Eris, Pluto was known as the largest Keiper belt object. This dwarf planet has replaced Pluto in size and is accompanied by a satellite that has been given the name Dysnomia. Learn about this distant world here...
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Observatorio Arval: Clyde Tombaugh
This is a biography page for the American astronomer and discoverer of Pluto, Clyde Tombaugh.