1. Dominance in its orbital neighborhood: Pluto shares its orbital space with other icy bodies in the Kuiper Belt. This means it doesn't have gravitational dominance in its region, unlike planets like Earth or Mars.
2. Cleared its orbital path: Pluto hasn't cleared its orbital path of other celestial bodies. It shares its orbit with many other objects in the Kuiper Belt, which is a large collection of icy objects beyond Neptune.
These are the key reasons why Pluto was reclassified as a "dwarf planet" by the International Astronomical Union (IAU) in 2006.
However, it's important to note that there's ongoing discussion and debate about the definition of a planet. Some scientists argue that the dominance criterion is arbitrary and that Pluto, with its unique features and rich history, should be considered a planet.
