Pluto lost its planetary status over a decade ago. And it's because it missed one of the three criteria defined by the IAU:
1. It needs to orbit the sun: Pluto passed this one.
2. It has to have sufficient mass to assume a nearly round shape (hydrostatic equilibrium). Passed
3. It has to have “cleared the neighborhood” around its orbit. Failed
Pluto failed on that one because there are still several large objects in that distant outer orbit range called the Kuiper belt, including Eris, another dwarf planet even more massive than Pluto, although Pluto is slightly larger in size.
Pluto is still the 9th largest object directly orbiting the Sun, maybe one day it will regain its status.
Dark Space
