You forgot one... a planet's orbit should be distinct from other planets' orbits... in other words, two planets' orbits should not cross paths... This is true for the other 8, but Pluto cuts across Neptune's orbit, which is a big no-no.

In reply to Re^2: Should Pluto Get Its Planethood Back? by Anonymous Monk
in thread Should Pluto Get Its Planethood Back? by Arunbear

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