They discovered Pluto wasn’t a planet
A) 1930
B) 2006
C) Prague, Czech
D) Because NASA discovered it wasn’t a real planet
They discovered Pluto wasn’t a planet
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The correct answer is B) 2006.
In 2006, the International Astronomical Union redefined the criteria for what constitutes a planet, and Pluto was reclassified as a “dwarf planet.” This decision was based on Pluto’s inability to clear its orbit of other debris, which is one of the new criteria for being classified as a planet.