Starfleet Planetary Classification Index (Revised)

[robkelk]

...
Class C: ???
---Example: Mercury
Class D (Geoinactive): no tectonic activity, no atmosphere
---Example: Luna
...

"[N]o tectonic activity, no atmosphere" describes Mercury and Ceres as well as it describes Luna.
--
Rob Kelk
"Governments have no right to question the loyalty of those who oppose
them. Adversaries remain citizens of the same state, common subjects of
the same sovereign, servants of the same law."

- Michael Ignatieff, addressing Stanford University in 2012