When I was in kindergarden, they tought us a song about the order of the planets. I don't remember it at all but I am fairly sure that Pluto was a big part of it. Being the last planet, it probably had its own verse. What do you think happened top that song when they found out that Pluto was actually not a planet? Well I have no idea, but Pluto is not a planet because it doesn't clear its neighborhood. There are three requirements for being a planet. 1. orbits the sun, check 2. spherical, check. 3. gets rid of everything in its neighborhood. Nope. Pluto has stuff in its neighborhood. Therefore, it is not a planet.
Asteroid Hermes is not a planet. It is, in actuality, an asteroid. Hermes is not a planet because it doesn't control everything in its area and it's not a sphere. Also it doesn't orbit the sun.
