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Pluto was met with great excitement upon its discovery in 1930 and was accepted as the ninth planet of the Solar System. Despite its small size, it was regarded as a “planet” in school textbooks, scientific studies, and public perception for approximately 76 years. However, in 2006, the International Astronomical Union (IAU) made a decisive change to Pluto’s status: Pluto was no longer classified as a planet but as a “dwarf planet.” Why was this decision made? What had changed? Until that time,