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"There were initially 9 planets, but later Pluto was removed, leaving only 8. What could be the reasons for this?" #Opinion
Non-Dominant Orbit: Pluto is not gravitationally dominant in its zone.
Size Similarity: Other objects in the Kuiper Belt, like Eris, are similar in size.
Orbit Tilt: Its orbit is highly inclined compared to the main planets.
Shared Neighborhood: Pluto coexists with many other objects in its orbital path.
Low Mass: Itβs smaller than Earth's Moon, making it less comparable to larger planets.
Classification Update: The IAU refined the definition of planets in 2006.
Dwarf Planet Category: Pluto fits better under this newer category.