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 F - Geometallic

Age: 1-3 billion years

Diameter: 10,000 - 15,000 km

Location: Ecosphere

Surface: Volcanic eruptions due to molten core

Atmosphere: Hydrogen compounds

Evolution: Cools to become Class-G

Life-Forms: Silicon-based (Horta)

Examples: Janus VI

Glass F planets are generally located in a star's habitable zone. Similar in size to Earth, they rage from 10,000 to 15,000 kilometers in diameter. Class F planets are former Class E planets that have cooled, but retain a molten core, and an atmosphere containing hydrogen compounds. Class F planets will eventually cool to become class G.

Although they are not well suited for humanoid life forms, they support silicon-based life quite well. Janus VI, the mineral rich home world of the Horta in "Devil in the Dark" (TOS), is one such world.

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