MPPSC 2012 General Studies Solved Paper-1

(C) In 2005, Eris, a dwarf planet in the scattered disc which is 27% more massive than Pluto, was discovered. This led the International Astronomical Union (IAU) to define the term‘planet’ formally in 2006, during its 26th General Assembly. That definition excluded Pluto and reclassified it as a dwarf planet.