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Re^2: Should Pluto Get Its Planethood Back?by Anonymous Monk |
on Mar 24, 2017 at 18:35 UTC ( [id://1185818]=note: print w/replies, xml ) | Need Help?? |
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.
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