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The issue was brought to a head by the discovery of Eris, an object in the scattered disc far beyond the Kuiper belt, that is now known to be 27 percent more massive than Pluto.[77] In response, the International Astronomical Union (IAU), was forced to define a planet for the first time, and in so doing included in their definition that a planet must have "cleared the neighbourhood around its orbit."[78] As Pluto shared its orbit with so many KBOs, it was deemed not to have cleared its orbit, and was thus reclassified from a planet to a member of the Kuiper belt.
Could they have removed Pluto from the name as a planet to leave only 8 planets so that in the future(presumably this century) they will name another planet beyond Pluto and to ignore the argument that the newly found planet is 'Planet X'.