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 N - Reducing

Age: 3-10 billion years

Diameter: 10,000 - 15,000 km

Location: Ecosphere

Surface: High surface temperature due to greenhouse effect; water exists only as vapor

Atmosphere: Extremely dense, carbon dioxide and sulfides

Life-Forms: Unknown

Examples: Venus

Class N planets typically are found in a star's habitable zone. Similar to Earth in size, they range from 10 to 15 thousand kilometers in diameter. Due to the "greenhouse effect" caused by their dense atmospheres, they have high surface temperatures. Water on Class N planets is in vapor form, which prohibits the presence of many life forms.

The planet Venus in Earth's star system is a Class N planet.

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