Question

In 2006, a controversial decision was made by the International Astronomical Union regarding one of the planets. What was it?

Answer 1

Hey Friend,
That important decision was to remove Pluto from the list of the planets in the solar system due to its lacking of properties of being a planet.....
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Answer 2

In 2006, the International Astronomical Union made a controversial decision about not considering pluto as a planet anymore and it is being considered as a dwarf since then.
Hope it helps you