Alan Stearn, planetary scientist, believes Pluto is a planet.
It's a planet. Science doesn't work by voting. Did people vote on the theory of relativity? No! It's either right or it's wrong. Do we vote on whether genetics is a good theory or not? Of course not. Either data supports the observations or they don't. Voting doesn't work in science. Pluto is as far across as Manhattan to Miami, but its atmosphere is bigger than the Earth's. It has 5 moons, it has atmosphere, weather. If it walks like a duck, it's a duck. We're showing the world this beautiful planet. And it's a double planet, which is even more awesome.
Pluto met the first two of the these criteria, but the last one proved pivotal. "Clearing the neighbourhood" means that the planet has either "vacuumed up" or ejected other large objects in its vicinity of space. In other words, it has achieved gravitational dominance. ⠀⠀⠀⠀⠀⠀⠀⠀⠀ Because Pluto shares its orbital neighbourhood with other icy Kuiper Belt Objects, the resolution effectively stripped the distant world of a planetary designation it had held for some 76 years. ⠀⠀⠀⠀⠀⠀⠀⠀⠀ It was immediately relegated it to the distinct category of "dwarf planet", alongside the biggest body in the asteroid belt, Ceres, and other large Kuiper Belt Objects such as Eris, Quaoar and Sedna.