Because that sentence doesn’t really make sense. “Criteria” is a human concept. Nature doesn’t do “criteria”, nor “objective” for that matter. So, yes, there’s no “natural criteria” for when something is X or Y, we, humans, make those criteria. Doesn’t matter if it’s in relation to animals, plants, or planets.
Not objective in the sense that aliens would come to the same definition for what is and isn’t a planet. Compare that to something like what the elements are.
Because that sentence doesn’t really make sense. “Criteria” is a human concept. Nature doesn’t do “criteria”, nor “objective” for that matter. So, yes, there’s no “natural criteria” for when something is X or Y, we, humans, make those criteria. Doesn’t matter if it’s in relation to animals, plants, or planets.
So you’re saying things just exist, and as humans we categorize them? Because that’s what I said.
The idea of a “category” is inherently human. Just like “objective” and “criteria”.
Which means there is objective criteria for what is categorised as a planet - it’s whatever we, humans, define them to be.
Not objective in the sense that aliens would come to the same definition for what is and isn’t a planet. Compare that to something like what the elements are.