An organically grown planet definition | Astronomy.com
"This new schema for planet — properly defined by expert planetary scientists — will powerfully work itself out in grade school classrooms. Rather than teaching students the names of all the planets, teachers should emphasize the types and subtypes of planets and how the solar system is naturally organized outward from the Sun, using a handful of planets as examples. This is analogous to learning the organization of the periodic table of the elements without having to memorize all or even most of the 100+ names."