@benhamill It's kind of interesting how polarised the astronomical community is about the definition of planet. Guests on Planetary Radio give it a lot of shade.

There's also an astrogeologist (I forget his name) who, at an upcoming IAU conference, who's proposing a new (alternative) definition that would classify about 112 known solar system bodies as planets.

"But that's too many! How will kids learn all of them?"

His answer: they don't need to. Give them the definition & let them infer what is, and isn't a planet.

He likened this to the periodic table: not many people memorise it, but if they understand the structure, they have an idea of what's what.