Why are you amazed? These sort of taxonomical debates are exceedingly coming in biology (eg "is this a new species or just another variant?", "how many base pa

Why are you amazed? These sort of taxonomical debates are exceedingly coming in biology (eg "is this a new species or just another variant?", "how many base pair differences are required to be a species?", Etc). Taxonomy for planets and other celestial bodies is increasingly important as we discover more and more exoplanets. And it turns out that writing a good definition is hard... especially when we have so few exemplars in our own solar system.