In what year was Pluto reclassified from a planet to a dwarf planet?
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Pluto's reclassification by the International Astronomical Union (IAU) in 2006 sparked much debate. It was demoted because it failed to meet the new criterion of 'clearing its orbit' of other debris, unlike the eight major planets. This decision led to the formal definition of a 'dwarf planet' and the inclusion of other similar bodies. Photo: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Inst, Wikimedia Commons, Public domain.
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Source: Wikipedia (CC BY-SA)
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