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 O - Plegaic


Age: 3-10 billion years

Diameter: 10,000 - 15,000 km

Location: Ecosphere

Surface: Liquid water covers 80% or more of surface area

Atmosphere: Nitrogen, oxygen, trace elements

Life-Forms: Aquatic vegetation, animal life, humanoids

Examples: Argo, Pacifica

Class O planets typically reside in a star's habitable zone, or Ecosphere. Similar to Earth in size, they range from 10,000 to 15 thousand kilometers in diameter. Like Earth, they have an atmosphere that contains oxygen and nitrogen. However, 80% or more of planetary surface is coverd by water. Water and life forms are typically abundant.

These planets are largely water based in nature, and as a result can support a wide variety of marine lifeforms. Such planets are similar to Class -M's geological constituents in many ways, though land masses are either non-existent or are limited to few small islands where oceanic mountain ranges break the surface. Atmospherically, such worlds posses very dense atmospheres, and extreme tropical heat and humidity. Quite rarely happened upon, they offer research opportunities into planetary science, but their colonization potential is limited. Argo, a planet in the Alpha quadrant, near the flight path of the Crystalline Entity in "Silicon Avatar" (TNG), is Class O. The beautiful water planet, Pacifica, is also Class O. Known for it's warm blue waters and white beaches, it was seen in "Conspiracy" (TNG) and "Manhunt" (TNT).



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