And don't forget the plutoids, — dwarf planets beyond the orbit of Pluto — and the trans-Neptunian objects, which include the plutoids and other small solar system bodies that orbit beyond ...

Things have been a mess since Pluto's demotion. In 2006, the International Astronomical Union (IAU) voted on the definition of a planet. Famously, Pluto no longer met the criteria and was demoted ...