I'm suprised they don't subdivide the classical into two separations of terrestrial (rocky, but with a significant atmosphere to cause weathering) and gas giant.

Also whatever happened to the term "planetoid"?

Or why not borrow from Star Trek or other sci-fi and write up a whole planetary classification system?

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Barbequed Pixels?

Your friendly neighborhood Wings3D nut.
Also feel free to browse my freebies at ShareCG.
There might be something worth downloading.