"Any lump of matter large enough to form a sphere around a star should be classified as a planet."
— Pluto

January 1, 1970

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Added on April 10, 2026
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Dwarf planets
Original Language: English

Sources

Dr Dimitar Sasselov and Dr Gingerich quoted by Jonathan O'Callaghan in: "Should Pluto be a planet again? Panel votes to reinstate ninth world of the solar system in unofficial debate"