* Orbit the Sun: This is the defining feature of a planet. They are gravitationally bound to the Sun and travel in an elliptical orbit around it.

* Have cleared their neighborhood: This means they have become gravitationally dominant in their orbital region, having cleared away most other objects.

* Are not a star: This distinguishes them from dwarf planets like Pluto, which haven't cleared their neighborhood.

Let me know if you'd like to know more about any of these characteristics!