Context: For anyone who grew up before 2006, Pluto was the ninth planet. Then the International Astronomical Union changed the definition of a planet and poor Pluto got demoted to dwarf planet status. Now it's just a nostalgic memory, and Grandpa Simpson says it best.

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[–] slazer2au@lemmy.world 8 points 1 day ago (1 child)

In his time Ceres was also a planet so there were more then 9.

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[–] marcos@lemmy.world 7 points 1 day ago

It wasn't, though. The planets were basically defined as "it's those 9 there".

People only started to push for a property-based definition when we started finding exoplanets. And only really moved into it when a 11th candidate was found and there were some 3 or 4 more possible ones.

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