Ronald Held wrote:
Mars looked dead to me in the early 1960's.
Since Enterprise labeled "earthlike" planets Minshara which likely got truncated or abbreviated to M, the question remain whether the esrly Starfleet took the planetary classification schema from Vulcan Earth or some mixture?
[Henry Jones, Sr.] Except... the first letter of Mishara
in the Vulcan alphabet is an I! [/Jones]