<![CDATA[Pluto my Beloved]]>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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]]>https://forum.ieu.app/topic/ff5735f4-36e8-4a8a-8028-21bd90e3087c/pluto-my-belovedRSS for NodeSun, 06 Sep 2026 00:23:45 GMTTue, 25 Aug 2026 13:15:51 GMT60<![CDATA[Reply to Pluto my Beloved on Tue, 25 Aug 2026 16:08:20 GMT]]>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.

]]>https://forum.ieu.app/post/https://lemmy.world/comment/25480151https://forum.ieu.app/post/https://lemmy.world/comment/25480151Tue, 25 Aug 2026 16:08:20 GMT<![CDATA[Reply to Pluto my Beloved on Tue, 25 Aug 2026 13:20:38 GMT]]>In his time Ceres was also a planet so there were more then 9.

]]>https://forum.ieu.app/post/https://lemmy.world/comment/25477244https://forum.ieu.app/post/https://lemmy.world/comment/25477244Tue, 25 Aug 2026 13:20:38 GMT