Planet Specifications (Cont'd)
Class N  -  10,000 to 15,000 km
Class O  -  10,000 to 15,000 km
Class P  -  2,000 to 15,000 km
Class Q  -  8,000 to 15,000 km
Class R  -  2,000 to 15,000 km
Class S  -  10,000,000 to 50,000,000 km
Class T  -  50,000,000 to 120,000,000 km
Class X, Y, & Z  -  8,000 to 15,000 km
Also known as "Reducing" planets, these celestial bodies have rocky and barren surfaces with extremely high atmospheric temperatures caused by an intense greenhouse effect. Their atmospheres are extremely dense comprising mainly carbon dioxide and corrosive sulfides. Sometimes water vapor is present. Life on these hostile planets would be limited to cingle-celled organisms living high in the upper layers of the of the atmosphere. Venus is Class N. Some Class N planets fall into the X, Y, and Z Demon planet class, especially if a bizarre form of life exists on them.
"Oceanic" worlds, such as Pacifica, are formed in the "Habitable Zone", usually closer than Class M planets would normally be in relation to their star type and size. With over 80% of the surface covered in liquid, it would be seen from space as a big ball of water, but this is hardly the case. With major tectonic activity going on beneath the seas, these plates sit atop a molten rock mantle. Underwater volcanoes are usually present with most of the land on Class O planets being created from them.
Very similar to Class O planets, "Glaciated" or Class P planets contain water that is frozen instead of in its liquid form, with aquifiers scattered deep beneath the surface. Any life developing on Class P planets would have to adapt to extremely frigid conditions. Jupiter's moons Europa, Callisto, and Ganymede are Class P bodies, as well as the Andorian and Breen homeworlds.
Class Q planets are also commonly referred to as "Variable" planets as they have variable surface conditions most of the time. This happens when either the planet orbits a Variable Star (whose power output fluctuates), or their distance from their parent star varies greatly due to a highly eccentric orbit. The result is a world where temperatures fluctuate within extreme levels. Aly life existing here will have to adapt to rapid climate changes. A Class Q designation can also be applied to planets whose conditions vary due to other effects, either natural or artificial: for example, the planet Meridian in the Gamma Quadrant could be considered Q Class as the planet shifts in between dimensions, existing as solid matter and then as energy for unequal periods of time.
Rogue planets, known in the scientific community as Class R planetary bodies, do not orbit stars. Instead, they float in the cold darkness of outer space. They most likely normally formed within a solar system but have been flung deep into space, usually caused by a collision with another planetary body. The surface of Rogue planets would most likely be barren, but some may be temperate due to geothermal venting with atmospheres filled with volcanic gases. Life would be most unlikely, however some may have unusual life gathering near volcanic regions. Plant life, if any, would be non-photosynthetic in nature. The Founders' Homeworld is a perfect example of a Class R Rogue planet.
Class S "Ultragiants" are extremely large planets made up of mostly gases and have a very strong gravitational pull, usually having hundreds of moons. Class S Ultragiants range in size from 10 million to 50 million kilometers in diameter. Due to the intense gravitational pull of  these planets, if they orbit too close to their parent star they could create a considerable 'wobble effect' in the star.
Class T "Ultragiants" are extremely large planets made up of mostly gases and have an even stronger gravitational pull than their Class S counterparts. They range in size from 50 million to 120 million kilometers in diameter, since any larger would have to be considered as full blown stars. Class T Ultragiants can have hundrets, if not thousands of moons. Due to the extreme gravity these gas giants radiate, any moons orbiting a Class T would be subjected to extreme geological stress, gigantic waves (in the case of Class M or O moons), and very powerful currents.
These classes are reserved for strange planets referred to as "Demon" worlds where surface conditions do not fall into any other recognized category. Such worlds are usually hostile and lethal to humanoid life. If life develops on these worlds they usually take on many bizarre forms, such as living crystal or rock, liquid or gaseous physical states, non-corporeal or dimensional states or be energy-based. In the delta quadrant, the USS Voyager explored a Class Y demon planet and the Tholian homeworld is a Class X Demon.
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