Science: On 24 August 2006 the International Astronomical Union…

Question

Did you know? On 24 August 2006 the International Astronomical Union demoted Pluto from planet to dwarf planet. The trigger was the 2005 discovery of Eris — about the size of Pluto. Astronomers had to choose: keep Pluto and accept dozens more planets, or pick a stricter criterion. They chose the latter.

Accepted Answer

On 24 August 2006 the International Astronomical Union demoted Pluto from planet to dwarf planet. The trigger was the 2005 discovery of Eris — about the size of Pluto. Astronomers had to choose: keep Pluto and accept dozens more planets, or pick a stricter criterion. They chose the latter.

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