In which year did the International Astronomical Union

Solution

• Reclassification of Pluto: o Pluto was reclassified as a dwarf planet by the International Astronomical Union (IAU) in 2006. • Reason for Reclassification: o The reclassification was based on a new definition of what constitutes a planet. Pluto was found not to meet all the criteria, particularly its inability to clear its orbit of other debris. • Impact of the Decision: o This decision removed Pluto from its position as the ninth planet in our solar system, which had been its status since its discovery in 1930. The shift in classification sparked debates and changed the way we understand the solar system.