Task: Text Categorization
Input (English): This celestial object is the largest in a namesake class of bodies that have 2:3 mean motion resonance with a certain larger body. Nix and Hydra are two satellites of this body, the presence of which was originally predicted by Perceval Lowell. The New Horizons probe is en route to this celestial object. The discovery of Eris raised controversy regarding this object, which was discovered by Clyde (*) Tombaugh. It and its largest satellite are sometimes referred to as a binary planet system, although Charon is still officially classified as a moon of this body. This body's highly eccentric orbit occasionally brings it closer to the Sun than Neptune. For ten points, identify this celestial object that was stripped of its "planet" status in 2006.
Output (English): Science