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 C - Geoinactive

Age: 2-10 billion years

Diameter: 1,000 - 10,000 km

Location: Ecosphere or Cold Zones

Surface: Low surface temperature

Atmosphere: Frozen

Life-Forms: None known

Examples: Pluto, Psi 2000

Class C planets generally reside in a star's habitable or cold zones. Smaller than Earth, they range from 1,000 to 10,000 kilometers in diameter. Due to low solar radiation and minimal internal heat, Class C planets usually have a frozen atmosphere, which is not compatible with life.

The frozen planet Psi 2000, seen in "The Naked Time" (TOS), is a Class C planet. Prior to the disintegration of the planet in 2266, the entire Federation Science team stationed there was found dead due to the effects of a virus.

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