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Pluto mission: South African astronomers join forces with NASA to learn more about the dwarf planet

Dwarf planet Eris is 'squishier' than expected. Eris is about the size of Pluto but around 50% farther from the sun. The discovery of Eris in the Kuiper Belt beyond Neptune in 2005 prompted the debate that ultimately reclassified Pluto as a dwarf planet.