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Planets are generally divided into two main types: large, low-density gas giants, and smaller, rocky terrestrials. Since 1992, hundreds of planets around other stars ("extrasolar planets" or "exoplanets") in the Milky Way Galaxy have been discovered. As of December 2010, Earth has discovered over 500 known extrasolar planets are listed in the Extrasolar Planets Encyclopaedia, ranging from the size of terrestrial planets somewhat larger than Earth to gas giants larger than Jupiter.

United Federation Starfleet Planetary Classfication

Planetary classification systems were used by many races to categorize planets. Various factors were taken into consideration, including atmospheric composition, surface temperature, vegetation and size. The classification system used by the Federation used single-letter designations, for example class M to describe a planet able to support humanoid life for long periods, while the Vulcans used the term "Minshara class" to describe a similar planet. For a complete list of planetary classifications, please see below;

UFS Planetary Classification







United Federation Starfleet Star Classfication

Star Classification within United Federation Starfleet is very similar to Planetary Classification with letters to distinguish between the certain characteristics of that type of Star. It is important to note that all Star's are different and may show characteristics of more then one established Class of Star. When this occurs, usually the Star is labelled into its own Class which is relayed to United Federation Starfleet Science for confirmation before being added to the database. Stars are usually classified by Temperature and Composition, although surface area may serve as a distinguishing factor. Stars can also be classified by the apparent "colour" of the light that they produce, for example, a "Class A" will usually be of a "light blue" colour.

UFS Star Classification

((NOTE: Each spectral class is divided into 10 subclasses, ranging from 0 (hottest) to 9 (coolest). Stars are also divided into six catagories according to luminosity; 1a (most luminous supergiant), 1b (less luminous supergiant), II (luminous giants), III (normal giants), IV (subgiants) and V (main sequence and dwarfs). For instance, Pinastri is classified as G2V, which means that is a relatively hot G-Class (or G-Type) main sequence star. In addition, classes R, N, S, T, Q and W are relatively rare star types not found in the main sequence.))


Class 17 Nebula.jpg

A Nebula is an interstellar cloud of dust, hydrogen gas, helium gas and other ionized gases. Originally, nebula was a general name for any extended astronomical object, including galaxies beyond the Milky Way (some examples of the older usage survived, for example, the Andromeda Galaxy was referred to as the Andromeda Nebula before galaxies were discovered by Edwin Hubble). Nebulae often form star-forming regions, such as in the Eagle Nebula. This nebula is depicted in one of NASA's most famous images, the "Pillars of Creation". In these regions the formations of gas, dust, and other materials "clump" together to form larger masses, which attract further matter, and eventually will become big enough to form stars. The remaining materials are then believed to form planets, and other planetary system objects.

Many nebulae or stars form from the gravitational collapse of gas in the interstellar medium or ISM. As the material collapses under its own weight, massive stars may form in the center, and their ultraviolet radiation ionises the surrounding gas, making it visible at optical wavelengths. Examples of these types of nebulae are the Rosette Nebula and the Pelican Nebula. The size of these nebulae, known as HII regions, varies depending on the size of the original cloud of gas. These are sites where star formation occurs. The formed stars are sometimes known as a young, loose cluster.


Other nebulae may form as planetary nebulae. This is the final stage of a low-mass star's life, like Earth's Sun. Stars with a mass up to 8-10 solar masses evolve into red giants and slowly lose their outer layers during pulsations in their atmospheres. When a star has lost enough material, its temperature increases and the ultraviolet radiation it emits can ionize the surrounding nebula that it has thrown off. The nebula is 97% Hydrogen and 3% Helium with trace materials. The main goal in this stage is to achieve equilibrium.

United Federation Starfleet Nebula Classfication

Nebula classification is somewhat different and more interesting then Planetary and Stellar Classifications. Both letters, for example "Class J" and numbers, for example "Class 17" are used along with certain names almost attributing to starship classes for example, "Mutara Class". Nebula's are usually grouped together because of certain physical characteristics which can be difficult to understand as some nebula's are visually very similar, for example "The Azure Nebula" which was "Class 11" and the "Class 17" that was encoutered by the USS Voyager in 2372 which were both visually similar although internal scans revealed that they were absolutely nothing alike.

UFS Nebula Classification

Spatial Anomaly

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United Federation Starfleet Spatial Anomaly Classification

Since new anomalies are encountered regulary and come in many different sizes and shapes, it can be difficult to catagorise them. Classification of anomolies is a constantly changing process that requires consant updating however, certain types of anomolies have been grouped together for easy reference and in an attempt to classify them. United Federation Starfleet uses the "Bower's Classification System" for identifying and classification of spatial anomalies.

UFS Spatial Anomaly Classification