As a result of scientific study, the IAU has now decided that instead of 9 planets, our solar system contains at least 12. So time to change your solar system map and re-remember the new planets.

The new definition of a planet is:

A planet is a celestial body that (a) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (b) is in orbit around a star, and is neither a star nor a satellite of a planet.