Celebrate the 18th anniversary of downgrading Pluto to a "dwarf planet"

I grew up when Pluto was a planet. But, as you no doubt know, 18 years ago, on August 24, 2006, poor Pluto was downgraded from a regular ol' planet planet to a dwarf planet. KCRA explains that:

the International Astronomical Union voted to strictly define a planet, which ultimately downgraded Pluto from the ninth planet from the sun to a dwarf planet — causing controversy both scientifically and culturally.

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