Galactic classifications

Galaxy classifications are sometimes used by the Federation to classify galaxies with letters as an alternative to galaxy classification by shape. It was developed in the year 2410.

Galaxy classifications

 * Class-A Galaxy (Milky Way Galaxy)
 * Consist of a flat, rotating disk containing stars, gas, and dust, and a central concentration of stars known as the bulge, with a central bar-shaped structure composed of stars.


 * Class-B Galaxy (Andromeda Galaxy, Triangulum Galaxy)
 * Consist of a flat, rotating disk containing stars, gas, and dust, and a central concentration of stars known as the bulge.


 * Class-C Galaxy
 * A galaxy that is a cross between Class-A and Class-B.


 * Class-D Galaxy
 * A ring-shaped galaxy that consists of massive, relatively young blue stars, which are extremely bright.


 * Class-E Galaxy (NGC 383)
 * A luminous galaxy with an active galactic nucleus.


 * Class-F Galaxy
 * A low luminosity galaxy.


 * Class-G Galaxy
 * A galaxy that is a cross between Class-B and Class-H.


 * Class-H Galaxy
 * A galaxy with an approximately ellipsoidal shape and a smooth, nearly featureless brightness profile.


 * Class-I Galaxy
 * A very large galaxy composed of 500 billion stars or more.


 * Class-J Galaxy
 * A small galaxy composed of up to several billion stars.


 * Class-K Galaxy
 * A galaxy with an irregular shape.


 * Class-L Galaxy
 * A galaxy with nuclei that produce spectral line emission from highly ionized gas.


 * Class-U Galaxy
 * A tidally disrupted galaxy.


 * Class-V Galaxy
 * A galaxy in the process of colliding with another galaxy.


 * Class-W Galaxy
 * A galaxy that orbits a larger galaxy due to gravitational attraction.


 * Class-X Galaxy
 * A galaxy in the process of an exceptionally high rate of star formation, compared to the usual star formation rate seen in most galaxies.


 * Class-Y Galaxy
 * A low-mass compact galaxy which is undergoing very high rates of star formation.


 * Class-Z Galaxy
 * A galaxy containing very few or no stars, held together by dark matter.