Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae and, as such, form part of the Hubble...

barred spiral galaxy is a spiral galaxy with a central bar-shaped structure composed of stars. Bars are found in about two thirds of all spiral galaxies in...

a large-scale disc but does not have large-scale spiral arms. Lenticular galaxies are disc galaxies that have used up or lost most of their interstellar...

dwarf galaxies in a ring at an arbitrary angle to the main disc. The Milky Way and the Andromeda Galaxy are a binary system of giant spiral galaxies belonging...

galaxies. Galaxies are categorized according to their visual morphology as elliptical, spiral, or irregular. The Milky Way is an example of a spiral galaxy...

Population I stars. A spiral galaxy maintains its spiral arms due to density wave theory. Below is a list of notable spiral galaxies with their own articles...

morphological classification scheme. Barless spiral galaxies are one of three general types of spiral galaxies under the de Vaucouleurs system classification...

strength in galaxies. The contribution of spiral arms to the total galaxy luminosity can reach 40–50% for some galaxies. The characteristics of spiral arms are...

dwarf spiral galaxies and irregular galaxies. SAm galaxies are a type of unbarred spiral galaxy, while SBm are a type of barred spiral galaxy. SABm are...

design spiral galaxy, flocculent (meaning "flaky") galaxies are patchy, with discontinuous spiral arms. Self-propagating star formation is the apparent...