Galactic classifications

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this article was thought of and created by Pikapi

Galaxy classifications are sometimes used by the Federation to classify galaxies with letters as an alternative to galaxy classification by shape.

Galaxy classifications

Class-A (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 (Andromeda Galaxy, Triangulum Galaxy, Messier 101)

Consist of a flat, rotating disk containing stars, gas, and dust, and a central concentration of stars known as the bulge.

Class-C

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

Class-D

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

Class-E (NGC 383)

A luminous galaxy with an active galactic nucleus.

Class-F

A low luminosity galaxy.

Class-G

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

Class-H

A galaxy with an approximately ellipsoidal shape and a smooth, nearly featureless brightness profile.

Class-I

A very large galaxy composed of 500 billion stars or more.

Class-J

A small galaxy composed of up to several billion stars.

Class-K

A galaxy with an irregular shape.

Class-L (NGC 5474, Miura Galaxy)

An small irregularly shaped galaxy.

Class-M

A galaxy with nuclei that produce spectral line emission from highly ionized gas.

Class-N

An old galaxy with only black holes.

Class-O

A galaxy in which an outer ring of gas and stars rotates over the poles of the galaxy.

Class-P

A galaxy whose defining characteristic is in emitting more than 10¹¹ solar luminosities in the far-infrared part of the electromagnetic spectrum.

Class-Q

A radio-loud, energetic galaxy with an active nucleus.

Class-R

A tidally disrupted galaxy.

Class-S

A star-forming galaxy at high redshift.

Class-T

A galaxy that emits Lyman-alpha radiation.

Class-U

A galaxy in the process of colliding with another galaxy.

Class-V

A system of two galaxies rotating around each other.

Class-W (Messier 110, Messier 32, Small Magellanic Cloud)

A galaxy that orbits a larger galaxy due to gravitational attraction.

Class-X

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

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

Class-Z

A galaxy containing very few or no stars, held together by dark matter.