Standard Planetary Classes

For purposes of reference, Vulcan scientists have established a number of broad categories of planetary types.

Class A – “hot” gas giant, ex. Jupiter
Class B – “cold” gas giant, ex. Uranus
Class C – “hothouse”, ex. Venus
Class D – airless rock
Class E – Super-terrestrial
Class F – Sulpher atmosphere
Class G – desert planet, minimal atmosphere, ex. Mars
Class H – early Earth w/ developing biosphere
Class I – hot, rocky, thin atmosphere, ex. Mercury
Class J – cold, rocky, thin atmosphere
Class K – desert planet, w/ atmosphere and biosphere, ex. Vulcan
Class L – Earth-like planet but oceans cover 33% or less of the surface
Class M – Earth-like planet
Class N – Earth-like planet but oceans cover 90% of the surface
Class O – Earth-like planet but colder
Class P – Atmosphere is frozen
Class Q – Ball of ice and rock, resembles a comet
Class R – like Class J but with nitrogen/ammonia atmosphere
Class S – Frozen methane oceans with floating continents, ex. Hydrax

Standard Planetary Classes

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