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 7500 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 7500 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 7500 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 7500 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: | Hydrogen, Helium |
| 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.