Planetary Classifications

Class A - Geothermal

Class B - Geomorteus

Class C - Geoinactive

Class D - Asteriod/Moon

Class E - Geoplastic

Class F - Geometallic

Class G - Geocrystalline

Class H - Desert

Class I - Gas Supergiant

Class J - Gas Giant

Class K - Adaptable

Class L - Marginal

Class M - Terrestrial

Class N - Reducing

Class O - Plegaic

Class P - Glaciated

Class Q - Variable

Class R - Rogue

Class S - Ultragiant

Class T - Ultragiant

Class Y - Demon

Class A - Geothermal

Age: 0-2 billion years

Diameter: 1,000 - 10,000 km

Location: Ecosphere or Cold Zones

Surface: Partially molten

Atmosphere: Primarily hydrogen compounds

Evolution: Cools to become a Class-C planet

Life-Forms: None known

Example: Gothos

Class A planets are generally found within a star's habitable or cold zone. They are smaller than Earth, ranging in size from 1,000 to 10,000 kilometers in diameter. Their surface is partially molten, with an atmosphere composed primarily of hydrogen compounds, making them unsuitable for humanoid life forms. They cool to become class C planets.

Gothos, the iron-silica planet created by Trelane in "The Squire of Gothos" (TOS), is a Class A planet. The surface of Gothos contains no vegetation or even detectable soil. Cursed with a toxic atmosphere, the planet is plagued by storms and continuous volcanic eruptions. Gothos was only capable of supporting life forms because Trelane artificially created a small area of Class M conditions.

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