Pluto's classification
Claim in the list: In 2006 Pluto was reclassified as a dwarf planet because it had not cleared other objects from its orbit.
Verification: Confirmed under the International Astronomical Union (IAU) definition adopted in 2006. A planet must orbit the Sun, be nearly round under its own gravity, and gravitationally dominate or “clear the neighbourhood” around its orbit. Pluto meets the first two conditions but not the third, and it is not a satellite, so it fits the dwarf-planet category. “Cleared” does not mean literally removing every speck of dust; it refers to dynamical dominance in the orbital zone.
Conclusion: The IAU reclassified Pluto as a dwarf planet in 2006, in part because it does not dominate its orbital neighbourhood.