Why Is Pluto Not a Planet

The video explores the history of planetary discovery, starting with the visible planets known since antiquity. It discusses the revolutionary discovery of Uranus and the subsequent identification of asteroids, which were initially considered planets. The focus then shifts to Pluto, discovered in 1930, and its unique characteristics that led to its reclassification as a dwarf planet. The video also covers the discovery of the Kuiper Belt and the International Astronomical Union's 2006 definition of a planet, which resulted in Pluto's demotion. The narrative highlights the evolving understanding of celestial objects and the creation of new categories like dwarf planets.

What significant discoveries were made about Pluto in the 1990s?

Why was Pluto reclassified as a dwarf planet?