Define terms. Always.
“Runyon and his colleagues (which included Alan Stern) offered the following definition for a planet:
“A planet is a sub-stellar mass body that has never undergone nuclear fusion and that has sufficient self-gravitation to assume a spheroidal shape adequately described by a triaxial ellipsoid regardless of its orbital parameters.”
https://www.universetoday.com/139956/new-reasons-why-pluto-should-be-considered-a-planet-after-all/
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