Nine years ago today, the International Astronomical Union demoted Pluto from a planet to a dwarf planet — a move that was resented because not only was it a tiny percentage of astronomers, actual planetary scientists were ignored, despite the fact that planetary scientists focus solely on planets, moons, and planetary systems while astronomers look at a large variety of celestial objects and cosmic phenomena.

"It's bulls---,"Alan Stern, the lead scientist behind NASA's New Horizons mission to Pluto, told Tech Insider in July (and said we could quote him on that).

It's not just that Pluto meets the main criteria for planethood - it is rounded by its own gravity - there are numerous reasons.