New Horizons visited Pluto 10 years ago. We're still learning from it

[NNadir]

6. Yeah, I know. They certainly aren't interested in my opinion nor should they be but...

...the criteria I would choose would not so much be based on size but would involve orbital parameters and spherical symmetry.

I know it orbits out of plane so there's that, and I'm certainly not a planetary astronomer, and the whole world can disagree with me, but as a stubborn old bastard, pluto is a planet in my heart if no one else's.

One of my favorite elements in the periodic table, plutonium was named on the consideration of of Pluto's former official status as a planet in the sequence uranium, neptunium, plutonium I would hate for my much beloved element to be called Gilese581gium.

Thus far, at least up until the recent adventures with comets and asteroids, out of Earth's orbital probes have been sent to planets.