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Cake day: June 12th, 2023

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  • Scientists didn’t become pickier - they just later found that Pluto was in a belt of thousands of massive object (called the Kuiper belt), like the asteroid belt but much bigger.

    When Ceres was discovered in 1801, it was thought to be a comet, later a planet, but after discovering it was one of many asteroids in the asteroid belt (which it wasn’t big enough to clear), they realized it wasn’t a planet.

    When Pluto was first discovered in 1930, it was in a similar situation as Ceres and thought of as a planet, but when other Kuiper belt objects started to be discovered by 1992, they realized Pluto also wasn’t a planet.