8 planets in the solar system
I am an astronomy fanatic so I’m concerned about this. But even for the most uninterested parties, they would have learnt at some parts of their education that our solar system contains 9 planets whether or not they can name the 9, and in order or not. Today the fact has changed: We’re left with 8 — Pluto has been reclassified as “dwarf planet” — thanks to a 2006 redefinition of planet. Previous redefinitions would have given us 3 additional ones, but no, the IAU has to leave us with 1 less with its conclusion. Now we can start telling people the solar system has 8 planets and be called a “liar” until people actually realise the change.