Planet Classification

There are an incredible number of variations for different kinds of worlds which can be enchanted in space, this is an index of the general planet types and their average conditions. Unless otherwise noted there can be variations which are outliers.

A / Geothermal

Type:	Rock
Age:	0-2 Billion Years
Atmosphere:	Sulfer Dioxide / Carbon Dioxide
Radius:	500 to 5,000 km
Surface:	Rocky / Partially Molten
Composition:	Igneous Silica and Basalt
Location:	Any
Habitability:	None

Class A planets are very small, barren worlds rife with volcanic activity. This activity traps carbon dioxide in the atmosphere and keeps temperatures on Class A planets very hot, no matter the location in a star system. When the volcanic activity ceases, the planet "dies" and is then considered a Class C planet. Examples include the planet Gothos.

B / Geomorteus

Type:	Rock
Age:	0-10 Billion Years
Atmosphere:	Oxygen / Sodium / Hydrogen
Radius:	500 to 5,000 km
Surface:	Barren / Molten in Places
Composition:	Iron, Potassium, Silicon
Location:	Hot Zone
Habitability:	None

Class B planets are generally small worlds located within a star system's Hot Zone. Highly unsuited for humanoid life, Class B planets have thin atmospheres composed primarily of helium and sodium. The surface is molten and highly unstable; temperatures range from 450° in the daylight, to nearly -200° at night. No life forms have ever been observed on Class B planetoids, though they are fairly common in the universe. Despite their small size, Class B planets are often extremely dense, with a large inner core, up to 55% of the planet's volume, that is made of molten iron. Examples include Mercury and Nebhillium.

C / Geoinactive

Type:	Rock
Age:	2-10 Billion Years
Atmosphere:	None
Radius:	500 to 5,000 km
Surface:	Barren and Cratered
Composition:	Anthracite and Basalt
Location:	Hot Zone / Echosphere / Cold Zone
Habitability:	None

When all volcanic activity on a Class A planet ceases, it is considered Class C. Essentially dead, these small worlds have cold, barren surfaces and possess no geological activity. These worlds are rocky and barren worlds which can exist in any zone of a star system, their surface temperature largely depends on the zone which they reside, generally speaking it runs between -150 to -120 degree's Celsius since most are located far enough away from the central star to absorb enough heat to bake the surface. However, it is possible for these planets to be close enough to the central star to have surface temperatures much higher, though generally below that of a Class B world. They tend to run smaller than a Class M world, with sizes ranging from that of moons up to just a bit smaller than an M Class world. The primary classification of this class is the lack of an atmosphere, no geological activity, and the lack of any ability to support life.

These worlds are often rich in minerals and make incredibly good candidates for mining operations. Some can even have semi-molten iron cores with rich deposits of minerals produced either by steady impact of meteorites during the early phases of their existence (usually these worlds begin as Class A worlds or similar and then become more inactive as they cool over several billion years). Examples include Psi 2000.

D / Dwarf

Type:	Rock
Age:	2-10 Billion Years
Atmosphere:	None / Very Tenuous
Radius:	50 to 2,000 km
Surface:	Barren / Cratered
Composition:	Frozen Hydrocarbons and Ice
Location:	Any
Habitability:	None

Also known as Plutonian objects, these tiny worlds are composed primarily of ice and are generally not considered true planets. Many moons and asteroids are considered Class D, as are the larger objects in a star system's Kuiper Belt. Most are not suitable for humanoid life, though many can be colonized via pressure domes. Examples include Pluto, Ceres, and Eredas-II.

E / Geoplastic

Type:	Rock
Age:	2-10 Billion Years
Atmosphere:	Hydrogen Compounds
Radius:	5,000 to 7,500 km
Surface:	Molten with High Surface Temperature
Composition:	Silicone, Iron, Magnesium, Aluminum
Location:	Ecosphere
Habitability:	Carbon Cycle Life

Class E planets represent the earliest stage in the evolution of a habitable planet. The core and crust is completely molten, making the planets susceptible to solar winds and radiation and subject to extremely high surface temperatures. The atmosphere is very thin, composed of hydrogen and helium. As the surface cools, the core and crust begin to harden, and the planet evolves into a Class F world.

F / Geometallic

Type:	Rock
Age:	1-3 Billion Years
Atmosphere:	Carbon Dioxide, Ammonia, Methane
Radius:	5,000 to 7,500 km
Surface:	Volcanic and Barren
Composition:	Silicone, Iron, Magnesium, Aluminum
Location:	Ecosphere
Habitability:	Bacteria

A Class E planet makes the transition to Class F once the crust and core have begun to harden. Volcanic activity is also commonplace on Class F worlds; the steam expelled from volcanic eruptions eventually condenses into water, giving rise to shallow seas in which simple bacteria thrive. When the planet's core is sufficiently cool, the volcanic activity ceases and the planet is considered Class G. Examples include Janus IV.

G / Geocrystalline

Type:	Rock
Age:	3-4 Billion Years
Atmosphere:	Carbon Dioxide, Oxygen, Nitrogen
Radius:	5,000 to 7,500 km
Surface:	Rocky and Mostly Barren
Composition:	Silicone, Iron, Magnesium, Aluminum
Location:	Ecosphere
Habitability:	Vegetation / Simple Organisms

After the core of a Class F planet is sufficiently cool, volcanic activity lessens and the planet is considered Class G. Oxygen and nitrogen are present in some abundance in the atmosphere, giving rise to increasingly complex organisms such as primitive vegetation like algae, and animals similar to sponges and jellyfish. As the surface cools, a Class G planet can evolve into a Class H, K, L, M, N, O, or P class world. Examples include Delta Vega.

H / Desert

Type:	Rock
Age:	4-10 Billion Years
Atmosphere:	Oxygen, Nitrogen, Argon, and Metals
Radius:	5,000 to 7,500 km
Surface:	Hot / Arid with < 20% Surface Water
Composition:	Silicone, Iron, Magnesium, Aluminum
Location:	Ecosphere
Habitability:	Drought-Resistant Plants & Animals

A planet is considered Class H if less than 20% of its surface is water. Though many Class H worlds are covered in sand, it is not required to be considered a desert; it must, however, receive little in the way of precipitation. These worlds are usually between 8,000 and 15,000 km in diameter. Drought-resistant plants and animals are common on Class H worlds, and many are inhabited by humanoid populations. Most Class H worlds are hot and arid, but conditions can vary greatly. Examples include Nimbus III and Ocampa.

I / Ice Giant / Uranian

Type:	Gas Giant
Age:	2-10 Billion Years
Atmosphere:	Hydrogen and Helium
Radius:	15,000 to 50,000 km
Surface:	Rock, Ice, Methane, and Ammonia
Composition:	Hydrogen, Helium
Location:	Cold Zone
Habitability:	None

Also known as Uranian planets, these gaseous giants have vastly different compositions from other giant worlds; the core is mostly rock and ice surrounded by a tenuous layers of methane, water, and ammonia. Additionally, the magnetic field is sharply inclined to the axis of rotation. Class I planets typically form on the fringe of a star system.

J / Jovian

Type:	Gas Giant
Age:	Unknown
Atmosphere:	Hydrogen , Helium
Radius:	25,000 to 250,000 km
Surface:	Liquid Metallic Hydrogen
Composition:	Gaseous and Liquid Hydrogen & Helium / Liquid Metallic Hydrogen
Location:	Cold Zone
Habitability:	None

These are prototypical gas giants, class J planets are massive spheres of liquid and gaseous hydrogen, with small cores of metallic hydrogen. Their atmospheres are extremely turbulent, with wind speeds in the most severe storms reaching 600 kph. Many Class J planets also possess impressive ring systems, composed primarily of rock, dust, and ice. They form in the Cold Zone of a star system, though typically much closer than Class I planets. Their atmospheres are extremely turbulent, with wind speeds in the most severe storms reaching 600 kph. Many Class J planets also possess impressive ring systems composed primarily of rock, dust, and ice. They form in the Cold Zone of a star system, though typically much closer than Class I planets. The strong magnetic and gravitational fields can pose a navigational hazard to nearby vessels and also can make extraction of Hydrogen more difficult than Class I worlds.

K / Adaptable

Type:	Rock
Age:	4-10 Billion Years
Atmosphere:	Oxygen, Nitrogen, Argon
Radius:	2,500 to 5,000 km
Surface:	Barren and Cratered
Composition:	Silicone, Iron, Magnesium, Aluminum
Location:	Echosphere
Habitability:	Adaptable

Though similar in appearance to Class H worlds, Class K planets lack the robust atmosphere of their desert counterparts. Though rare, primitive single-celled organisms have been known to exist, though more complex life never evolves. Humanoid colonization is, however, possible through the use of pressure domes and in some cases, terraforming. Adaptable planets represent an unfortunate part of planetary development: a failed world. Over the course of a terrestrial planet's long and arduous evolution (from Class E to F to G), something, somewhere goes wrong, and the blossoming young planet fails to reach its full potential. Volcanic activity slows to a halt, the tenuous atmosphere begins to disperse, any liquid on the surface evaporates, and the rocky young world essentially dies. These worlds have atmospheres of dwindling size after volcanic activity slows and the molten core begins to solidify. Examples include Mars and Mudd.

Though rare, simple single cell organisms can still thrive on these barren worlds more complex forms of life never evolve. As a result, Class K planets are easily colonized via the use of pressure domes, and are often prime candidates for terraforming. Average temperatures are quite cold by humanoid standards, but a warm summer day on a terraformed Class K planet might creep as high as 20°C.

L / Marginal

Type:	Rock
Age:	4-10 Billion Years
Atmosphere:	Argon & Oxygen with Trace Elements
Radius:	5,000 to 7,500 km
Surface:	Rocky with Little Surface Water
Composition:	Silicone, Iron, Magnesium, Aluminum
Location:	Ecosphere
Habitability:	Vegetation Only

Typically rocky, forested worlds devoid of animal life. They are, however, well-suited for humanoid colonization and are prime candidates for terraforming. Water is typically scarce, and if less than 20% of the surface is covered in water, the planet is considered Class H. Examples include Alarin III, Ciden II, and Indri VII.

M / Minshara / Terrestrial

Type:	Rock
Age:	4-10 Billion Years
Atmosphere:	Oxygen, Nitrogen, Argon
Radius:	5,000 to 7,500 km
Surface:	Abundant Surface Water, Temperate Climate
Composition:	Silicone, Iron, Magnesium, Aluminium
Location:	Ecosphere
Habitability:	Prime conditions for large populations of animal, planet, and humanoid life.

These planets are robust and varied worlds composed primarily of silicate rocks. Located in a star system's habitable zone, most are temperate worlds with vast blue oceans and wide swaths of verdant forest. However, conditions can vary greatly between worlds and still be considered Class M; as long as the surface is between 20 and 80 percent water, the climate is generally temperate, and the atmosphere made of oxygen and nitrogen, even dry rocky worlds or cold snowy planets can be Class M.

N / Reducing

Type:	Rock
Age:	3-10 Billion Years
Atmosphere:	Carbon Dioxide and Sulfides
Radius:	5,000 to 7,500 km
Surface:	Barren with High Surface Temperatures
Composition:	Silicone, Iron, Magnesium, Aluminium
Location:	Ecosphere
Habitability:	None

Though frequently found in the Ecosphere, Class N planets are not conducive to life. The terrain is barren, with surface temperatures in excess of 500° and an atmospheric pressure more than 90 times that of a Class-M world. Additionally, the atmosphere is very dense and composed of carbon dioxide; water exists only in the form of thick, vaporous clouds that shroud most of the planet. Examples include Venus.

O / Oceanic / Pelagic

Type:	Rock
Age:	3-10 Billion Years
Atmosphere:	Oxygen, Nitrogen, Argon
Radius:	5,000 to 7,500 km
Surface:	80% Water & Archipelagos
Composition:	Silicone, Iron, Magnesium, Aluminium
Location:	Ecosphere
Habitability:	Vegetation, Cetacean, Animal, Humanoid

Any planet with more than 80% of the surface covered in water is considered Class O. These worlds are usually very warm and possess vast cetacean populations in addition to tropical vegetation and animal life. Though rare, humanoid populations have also formed on Class O planets.

P / Glaciated

Type:	Rock
Age:	3-10 Billion Years
Atmosphere:	Oxygen, Nitrogen, Argon
Radius:	5,000 to 7,500 km
Surface:	Cold, Glaciated
Composition:	Silicon, Iron, Magnesium, Ice
Location:	Ecosphere, Cold Zone
Habitability:	Cold-Resistant Vegetation, Animal, and Humanoid

On the distant edge of a star system's ecosphere, habitable planets are still numerous, but they are a far cry from the lush garden worlds closer in. Cold, barren, and glaciated planet is covered in solid ice, and while many possess narrow stripes of green along the equator, where hearty plant and animal life may flourish, many glaciated worlds are entirely frozen. Despite the harsh conditions, humanoid life can thrive on a glaciated world. Any planet whose surface is more than 80% frozen is considered Class P. These glaciated worlds are typically very cold, with temperatures rarely exceeding the freezing point. Though not prime conditions for life, hearty plants and animals are not uncommon, and some species, such as the Aenar and the Andorians, have evolved on Class P worlds. Examples include Andorra and Rita Penthe.

Q / Variable

Type:	Rock
Age:	2-10 Billion Years
Atmosphere:	Varies - Nitrogen, Oxygen, Argon Ranging from Thin to Very Dense
Radius:	2,000 to 7,500 km
Surface:	Varies - Molten, Frozen, Jungle, etc.
Composition:	Silicon, Iron, Magnesium
Location:	Any
Habitability:	None

These rare planetoids typically develop with a highly eccentric orbit, or near stars with a variable output. As such, conditions on the planet's surface are widely varied. Deserts and rain forests exist within a few kilometers of each other, while glaciers can simultaneously lie very near the equator. Given the constant instability, is virtually impossible for life to exist on Class-Q worlds. Examples include the Genesis Planet.

R / Rogue

Type:	Rock
Age:	2-10 Billion Years
Atmosphere:	Volcanic Outgassing
Radius:	2,000 to 7,500 km
Surface:	Temperate
Composition:	Silicate Compounds and Iron
Location:	Interstellar Space
Habitability:	Non-Photosynthetic Plants, Animals

A Class R planet usually forms within a star system, but at some point in its evolution, the planet is expelled, likely the result of a catastrophic asteroid impact. The shift radically changes the planet's evolution; many planets merely die, but geologically active planets can sustain a habitable surface via volcanic outgassing and geothermal venting.

S / Gas Supergiant

Type:	Gas Giant
Age:	2-10 Billion Years
Atmosphere:	Hydrogen and Helium
Radius:	250,000 to 50,000,000 km
Surface:	Liquid Metallic Hydrogen
Composition:	Gaseous and Liquid Hydrogen & Helium / Liquid Metallic Hydrogen
Location:	Cold Zone
Habitability:	None

Aside from their immense size, Class S planets are very similar to their Class J counterparts, with liquid metallic hydrogen cores surrounded by a hydrogen and helium atmosphere. Aside from their colossal size, there is little that differentiates a Class S: Super Giant world from its Class J: Jovian counterpart. Located in a star system’s cold zone, they often boast impressive ring systems and harbor dozens of moons.

Giant worlds like Class S and the other gaseous planetoids tend to act as “shields” for the terrestrial planets in the ecosphere, as their powerful gravitational fields tend to divert comets and asteroids away from the interior of a star system. Examples include Tethe-Alla IV.

T / Transitional

Type:	Gas Giant / Rock Hybrid
Age:	2-10 Billion Years
Atmosphere:	Frozen Hydrocarbons, Ice, Hydrogen, Helium
Radius:	250,000 to 25,000,000 km
Surface:	Liquid Metallic Hydrogen
Composition:	Osmium, Iridium, Platinum, Tungsten
Location:	Cold Zone
Habitability:	None

Existing in size between the Class I ice giants and the Class V super-terrestrials, Class T planets are large enough and with strong enough gravity to retain a thick atmosphere of hydrogen, helium and hydrocarbons. The atmosphere transitions to oceans of semiliquid compressed hydrogen mixed with semisolid ice / hydrocarbon over a metallic ore core. Sometimes known as gas dwarfs - something of a misnomer for such large planets.

U / Gas Ultragiant

Type:	Gas Giant
Age:	2-10 Billion Years
Atmosphere:	Hydrogen and Helium
Radius:	25,000,000 to 60,000,000 km
Surface:	Liquid Metallic Hydrogen
Composition:	Gaseous and Liquid Hydrogen & Helium / Liquid Metallic Hydrogen
Location:	Cold Zone
Habitability:	None

Class U planets represent the upper limits of planetary masses. Most exist within a star system's Cold Zone and are very similar to Class S and J planets. If they are sufficiently massive (13 times more massive than Jupiter), deuterium ignites nuclear fusion within the core, and the planet becomes a red dwarf star, creating a binary star system.

These titanic gaseous worlds represent the upper limits of planetary masses. Structurally similar to their Class J and S counterparts, only on a far more grandiose scale, these planets have astounding diameter between 50,000,000 and 120,000,000 kilometers. Most Class U planets are content to loom in the cold zone of a star system, but if the planet is sufficiently massive (13 times the size of Jupiter), nuclear fusion ignites the deuterium within the core, and the planet becomes a red dwarf star, creating a binary star system.

The great mass of ultra giants that do not transition into stars occasionally force them to assume eccentric orbits. This causes them to spiral inward toward the heart of the star system and become a “Hot Jupiter,” a gas giant orbiting extremely close to its parent star. This destructive process disrupts the entire star system, ejecting smaller planets into interstellar space, and ultimately ends with the Class U planet’s demise as a desolate Class X world.

V / Super-Terrestrial

Type:	Rock
Age:	2-10 Billion Years
Atmosphere:	Carbon Dioxide, Oxygen, Hydrogen, Helium
Radius:	10,000 to 15,000 km
Surface:	High Pressure / Temperature
Composition:	Iron, Iridium, Tungsten, Nickel
Location:	Ecosphere / Cold Zone
Habitability:	Pressure Resistant Planet / Animal Life

The so-called "super-Earths," large rocky/metallic planets intermediate in size between terrestrial and ice giants. Their higher gravity allows them to retain dense, hydrogen-rich atmospheres. Surface temperature and pressure high and unsuitable for humanoid habitation, but complex high-temperature life can evolve, and they are potentially viable for colonisation using pressure domes.

W / Divided / Locked

Type:	Rock
Age:	0-10 Billion Years
Atmosphere:	Oxygen / Sodium / Hydrogen
Radius:	5,000 to 7,500 km
Surface:	Half Barren / Molten and Half Cold, Glaciated
Composition:	Iron, Potassium, Silicon
Location:	Hot Zone / Ecosphere
Habitability:	None

Rocky planets kept tidally locked to the parent star or sister planet by the intense gravitational interaction of other bodies in their system. One side is overlit and heated, displaying molten areas and a burnt, desert-like surface. The far side is kept in perpetual darkness and cold, sometimes with a more temperate dividing line if the atmosphere is dense enough to mediate the heat. Such planets may be colonised, and some display native life that has adapted to the extreme environment, often in unusual ways.

X / Chthonian

Type:	Rock
Age:	2-10 Billion Years
Atmosphere:	None
Radius:	500 to 5,000 km
Surface:	Barren & Extremely Hot
Composition:	Molten Iron
Location:	Hot Zone
Habitability:	None

Class X planets are the result of a failed Class T planet in a star system's Hot Zone. Instead of becoming a gas giant or red dwarf star, a Class X planet was stripped of its hydrogen/helium atmosphere. The result is a small, barren world similar to a Class B planet, but with no atmosphere and an extremely dense, metal-rich core.