On January 5, 2005, astronomers discovered a distant object beyond Pluto that would ultimately change how we define planets. In this episode of The Strange History Podcast, Amy explores the strange true story of Eris — the icy world that sparked a scientific identity crisis, forced astronomers to rewrite the rules of the solar system, and led to Pluto’s infamous reclassification. A fascinating look at how one discovery reshaped astronomy forever.

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