Alan Stern disagrees with Tyson. So do I. As Pluto would say, Tyson is no Carl Sagan.
Actually, I've been saying for some time that not only is Tyson the first to fill Carl Sagan's shoes, he's arguably doing an even better job. Tyson seems totally at ease in front of an audience; Sagan never did.
I find him a pretentious git. Unlike Sagan, he has done very little science, he is now an educator, rather than a scientist. Nothing wrong with that, but he gets passed off as an expert on everything, which he isn't. His ignorance in some areas, such as philosophy, is appalling.
The IAU decision was a farce with risible justification. A "dwarf" planet is still a planet. Just as a "giant" planet is still a planet.
There are 8 planets in our solar system, and that's a very reliable number. If we merge dwarf planets into the planet category, then the number will be "large and unknown". Either way, never again will the count be the "9" we were taught in school.
Scientific understanding changes, and people have to adapt to that.
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I don't think you understand the problem with the IAU decision, the flaws in process and scientific reasoning.