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11. The 2006 demotion of Pluto to the status of dwarf planet was precipitated by the discovery of what object orbiting beyond Pluto, believed to be 27 percent more massive than Pluto and named for the Greek goddess of strife and discord?

Steve Helber/AP
William & Mary professor Elizabeth Harbron displays vials with merocyanine and rhodamine dye in her lab in Williamsburg, Va.

Ceres

Eris

Nyx

Charon

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