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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New failcomment system also fails to publish my comments, it's not limited to yours. Keep trying, it will usually work, eventually.
Blogger deliberately trying to kill itself, I expect.
Captchas should be off. If it gives you one anyway, it's against my explicit instructions.