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Why Is Pluto No Longer a Planet?

The main event of the 2006 General Assembly of the IAU, the proposal that would come to demote Pluto, was a defining moment for the rest of the solar system as well. Fiercely debated by the members of the union, the resolution that was passed officially defined the term planet.

What was once a loose word used to describe a large object within the solar system was now specific: planets are celestial objects large enough to be made rounded by their gravitational orbit around the Sun and to have shooed away neighboring planetary objects and debris.

Pluto is now classified as a dwarf planet because, while it is large enough to have become spherical, it is not big enough to exert its orbital dominance and clear the neighborhood surrounding its orbit.

Before the resolution in 2006, the term planet had no working definition and was based on classification from before some of the major modern discoveries within the universe that were made possible by advances in technology.

To many citizens of Earth, the demotion of Pluto felt like a break from tradition, and it was precisely that—a positive step forward into a new light, new knowledge, and changing perspectives of the universe.

Credits @nasa @melodysheep_ @bbcnews

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