MAPS

Map of the System listed as "Alien Planet"

A Note on Classification of Planets

Class A, B and C

Typically small, young planets whose class depends on their age and solidity of their cores.

Class D

Class D objects are planetoids like asteroids and some moons.

Class E, F and G

Typically, Proto-Earth-sized planets whose class depends on their age and solidity of their cores.

Class H

Class H planets appear in the series as harsh desert worlds.

Class I

Class of gas giant, larger than Class J, and smaller than Class S and T.

Class J and Class T

Class J and Class T planets are gas giants. Class J are smaller than Class T which are considered "super", or "ultra", gas giants.

Class K

Class K planets are barren worlds with no native life. However, through terraforming, they can be made into Class M worlds (see below).

Class L

Class L planets are barely habitable worlds with primitive ecosystems.

Class M

Class M Planets are compatible with Human, Mimbari and Centauri without requirements for environmental alteration, Their atmospheres comprise nitrogen and oxygen and have an abundance of liquid water necessary for carbon-based life to exist. Extensive plant and animal life often flourishes; often, a sentient race is also present. Earth is a textbook example of a Class M world

Class N

Class N planets have a reducing environment and are barren and rocky with extremely high surface temperatures caused by thick atmospheres containing carbon dioxide and corrosive sulfides. Class N environments were mentioned as the ideal places to use oxidizer-free explosives. Class N planets are more related to Class M with the key difference being a higher ratio of water to land. Class N planets are preferred by Narn, Drazi and Markab.

Class O and P

Planets covered almost completely with water (class O), or water-ice (Class P).

Class Q

Planets with continually changing environments caused by peculiar orbits, an orbit around a variable output star, or some other factor which causes conditions to drastically change over time.

Class R

A rogue planetary body which is one that does not orbit a star but drifts freely in space.

Class S

Class of gas giant smaller than Class T and the next larger size up from Class I.

Class Y

Class Y planets are 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, like living crystal or rock, liquid or gaseous physical states, or incorporeal, dimensional, or energy-based states. Discovery of these planets has been rare, this classification is included for completeness

Class X and Z

Class X and Y planets are those which are listed as No-Go zones by other alien races, Class X are protectorates and Class Z are Interdicted planets. eg. The Planets observed in the Vorlon Empire are all considered class Z while those of the Mimbari protectorate are class X (some protectorate planets may have a further classification depending on their environment.)