This is a must-read article for anyone who cares about whether Pluto is a planet or not. I didn’t know this history: Ceres went through the same progression as Pluto.
As the first body discovered in the now-named asteroid belt (and not coincidentally the largest), Ceres was originally classified as a planet. When science learned that Ceres was far from unique, it was demoted along with its asteroid peers.
Originally shared by Brian Koberlein
Many people lament the demotion of Pluto from a planet to a dwarf planet. I actually think the demotion was the right choice. It has also happened before, to a planet known as Ceres.
“Under this definition, Pluto and Eris were categorized as dwarf planets. Ceres was also promoted to dwarf planet status, as were two other trans-Neptunian objects, Haumea and Makemake. So currently our solar system has 8 planets, 5 dwarf planets, and countless other small solar system bodies.”
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