Really great video that explains the rationale for changing the categorization of Pluto from planet to dwarf planet. It also gives some great historical context.
The solar system itself hasn’t changed but our knowledge of it has changed over time and the increased knowledge has forced us to change our categories and language. This video raises the interesting and challenging aspects of our desire to categorize and label things. Language itself in addition to categorizing and labeling are inductive processes and the “controversy” around Pluto is a great illustration of that.