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Why was Pluto reclassified from planet to dwarf planet?

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In August 2006 the International Astronomical Union (IAU) downgraded the status of Pluto to that of "dwarf planet." This means that from now on only the rocky worlds of the inner Solar System and the gas giants of the outer system will be designated as planets. read more

Pluto since its discovery in 1930 was considered as the 9th planet of our solar system and we were made to learn that even in school (there are things you realise when you grow up that not everything taught in school is a 100% correct). read more

The International Astronomical Union (IAU) downgraded the status of Pluto to that of a dwarf planet because it did not meet the three criteria the IAU uses to define a full-sized planet. Essentially Pluto meets all the criteria exce read more

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