(astronomy) A relatively nearby spiral galaxy in the Local Group, together with the Milky Way galaxy. It is at a distance of approximately 2.6 million light years from Earth, in the direction of the constellation Triangulum.

(galaxies) a type of galaxy created by ram pressure stripping the interstellar gas from a galaxy by the high temperature higher pressure intracluster medium, forming long tendrils of concentrated gas trailing behind the galaxy, which form nebulae and new stars, giving the appearance of celestial jellyfish

(astronomy) Any of a class of galaxies that have nuclei with excessive amounts of ultraviolet emissions.

(astronomy, galaxies) plural of galaxy cluster

(astronomy, galaxies) A cluster of hundreds of galaxies.

plural of galaxy group

(astronomy) A group of galaxies that hold together gravitationally.

A galaxy having a smooth, featureless light-profile. It is one of the three main classes of galaxies originally described by Edwin Hubble in his 1936 work “The Realm of the Nebulae”.

(astronomy) Type of galaxy that is very luminous at radio wavelengths.

(astronomy) A spiral galaxy in the Local Group and closest to the Milky Way, visible to the naked eye in the constellation of Andromeda, the brightest of the Messier objects and often referred to by its designation M31.