Pluto is no longer considered a planet because, in 2006, the International Astronomical Union (IAU) redefined the criteria for planets and Pluto, along with other small objects, is now classified as a dwarf planet.
Class 6 Science NCERT Chapter 12
Chapter 12 Beyond Earth
Why is Pluto no longer considered a planet?
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Pluto is no longer considered a planet because it does not meet the criteria set by the International Astronomical Union (IAU). Specifically, it fails to clear its orbit of other debris, leading to its reclassification as a dwarf planet.
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