this post was submitted on 23 Sep 2025
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That's a definitional question, though, is it not? I don't think any facts actually changed.
Yes. Ceres was considered a planet when discovered in 1801 and around the 1950s began to be classified as an asteroid. It is now considered a dwarf planet like Pluto. It's the largest thing in the asteroid belt but is still sort of planet shaped.
Okay then maybe the electron shells model of an atom. That was taught as fact and it's definitely not true even though it's still useful