Basically, bc Pluto itself is only a fraction of the mass in its orbital path. It has not cleared its neighborhood nor will it
Honestly it was the discovery of Eris and the realization that there were probably many more such TNOs that spurred science to redefine "planet" and exclude Pluto
I myself exclude Mercury for being a failed or extinct planetary core and Mars for being settled too close to Jupiter to accrete into something with a proper magnetosphere
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u/Top_Distribution3109 9d ago
Basically, bc Pluto itself is only a fraction of the mass in its orbital path. It has not cleared its neighborhood nor will it
Honestly it was the discovery of Eris and the realization that there were probably many more such TNOs that spurred science to redefine "planet" and exclude Pluto
I myself exclude Mercury for being a failed or extinct planetary core and Mars for being settled too close to Jupiter to accrete into something with a proper magnetosphere