I think because if we called both Eris and Pluto planets, then we’d have a bunch of other current dwarf planets that would also qualify, like Ceres, Makemake, etc.
On the upside pluto being classified as a dwarf planet is what of what got ceres promoted out of asteroid and into dwarf planet, and now its turning out to be super interesting with potential subsurface ice and possibly being the core remnant of a failed planet that was torn apart by jupiter before it could fully form.
I think because if we called both Eris and Pluto planets, then we’d have a bunch of other current dwarf planets that would also qualify, like Ceres, Makemake, etc.
I for one welcome all these Plutoid planets to the planet family.
What’s the downside, we have to make a new mnemonic? Or add a verse to the Blue’s Clues Planet Song? I think we’re capable.
On the upside pluto being classified as a dwarf planet is what of what got ceres promoted out of asteroid and into dwarf planet, and now its turning out to be super interesting with potential subsurface ice and possibly being the core remnant of a failed planet that was torn apart by jupiter before it could fully form.