Show notes
For seventy-six years, Pluto was a planet. Then, in 2005, astronomer Dr. Mike Brown discovered Eris - a distant icy world roughly the same size as Pluto - forcing astronomers to confront a question they had quietly avoided for decades: what actually counts as a planet?
The answer led to the 2006 vote that redefined the solar system and stripped Pluto of its status, turning Brown into the unlikely public face of a controversial decision.
But this story isn’t just about Pluto.
It’s about how scientific definitions evolve. It’s about the vast, largely unexplored region beyond Neptune known…
