Friday, November 5, 2021

Only Pluto is a Planet

Planet means wanderer. "from planasthai "to wander,""

The worlds from Mercury to Neptune have regular circular orbits.* Pluto not only wanders across Neptune's orbit, but wanders off the plane of the ecliptic. Pluto enters and exits the proper orbital domain, as it were. 

*More precisely, their orbits are all slightly ellipsoid in proportionately the same way across the same axis.

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