Planet is an arcane term with minimal utility for communicating what you are actually talking about. Whether something is a planet is dependent on not just its

Planet is an arcane term with minimal utility for communicating what you are actually talking about. Whether something is a planet is dependent on not just its own properties, but also the object's location and environment. Something that would be a planet in one location is not elsewhere. The definition of planet is also only applicable to our solar system. Even if you were in orbit around an object, you would not be able to know whether it was a planet or not. It's okay if you are trying to distinguish 8 specific objects from the rest of the universe, but that's about it. Planemo is a word describing what comes to people's minds when they think planet. A contraction of Planetary Mass Object, it is something large enough to be in hydrostatic equilibrium (round because of its own gravity) but small enough not to fuse elements. You can tell if something is a planemo just by looking at it. Earth: Planet? Yes. Planemo? Yes. Pluto: Planet? No. Planemo? Yes. Earth's Moon: Planet? No. Planemo? Yes. Earth's Moon if it didn't orbit the Earth: Planet? Maybe. Planemo? Yes. Mars' Moon Deimos: Planet? No. Planemo? No. Mars if it had the same orbit as Pluto: Planet? No. Planemo? Yes. Pluto if it had the same orbit as mars: Planet? Yes. Planemo? Yes. Hypothetical star in orbit around sun: Planet? Yes. Planemo? No. Tatooine: Planet? No clue. Planemo? Yes.