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Originally Posted by stephend
I think you are suggesting the whole thing needs to be renormalised?!
One perspective that might help is to imagine that Pluto's orbit was between Venus's and Earth's. If that were so, is it conceivable that someone would say "Venus is a planet and so is Earth but Pluto is not"?
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If Pluto's orbit was between Venus and Earth, it might be a planet, if Ceres was between Venus and Earth it might be a planet and if my auntie had balls she would be my uncle.
A small object that is the major body in its neighbourhood obviously is different from a small body that is one of many similar objects in similar orbits.
By the way, why is nobody getting uptight about the fact that
Eris is not a planet. It's bigger than Pluto and it has a satellite, so if people want to include Pluto, then they also have to include Eris, or is there some "logic" which gets around this?