I don't care much whether Pluto is called a planet, though it's nice seeing people actually talk about the Solar System.
But any definition of a planet that excludes Earth and Jupiter is worthless. "Sweeps out its orbit" is a kludgy phrasing to deal with the Neptune:Pluto 3:2 resonance, but no matter how you phrase it, Pluto is still there, crossing Neptune's orbit, and half the planets in the system have associated asteroids.
But any definition of a planet that excludes Earth and Jupiter is worthless. "Sweeps out its orbit" is a kludgy phrasing to deal with the Neptune:Pluto 3:2 resonance, but no matter how you phrase it, Pluto is still there, crossing Neptune's orbit, and half the planets in the system have associated asteroids.
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The requirment is "has cleared the neighbourhood around its orbit."
And further to this, 'cleared the neighbourhood', has a more specific meaning in IAU terminology. It refers to objects that share the *same* orbit as each other, not cross each others orbit.
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