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At the centre of the Hubble tuning fork, where the two spiral-galaxy branches and the elliptical branch join, lies an intermediate class of galaxies known as lenticulars and given the symbol S0. These galaxies consist of a bright central bulge , similar in appearance to an elliptical galaxy , surrounded by an extended, disk -like structure.
Hubble's scheme divides galaxies into three broad classes based on their visual appearance (originally on photographic plates): [4] Elliptical galaxies have smooth, featureless light distributions and appear as ellipses in images. They are denoted by the letter "E", followed by an integer n representing their degree of ellipticity on the sky. [5]
The giant elliptical galaxy ESO 325-4. An elliptical galaxy is a type of galaxy with an approximately ellipsoidal shape and a smooth, nearly featureless image. They are one of the three main classes of galaxy described by Edwin Hubble in his Hubble sequence and 1936 work The Realm of the Nebulae, [1] along with spiral and lenticular galaxies.
Recognition of the Milky Way and the Andromeda nebula as two separate galaxies by Edwin Hubble. [citation needed] First Seyfert galaxy: NGC 1068 (M77) Cetus: 1943 (1908) The characteristics of Seyfert galaxies were first observed in M77 in 1908; however, Seyferts were defined as a class in 1943. [24] First radio galaxy: Cygnus A: Cygnus: 1951
Types of galaxies according to the Hubble classification scheme : an E indicates a type of elliptical galaxy; an S is a spiral; and SB is a barred spiral galaxy. Galaxies come in three main types: ellipticals, spirals, and irregulars. A slightly more extensive description of galaxy types based on their appearance is given by the Hubble sequence.
Blue-hued galaxies are the closest, bursting with star formation and easily seen in visible light by Hubble. The red galaxies are more distant, best detected by Webb in infrared light.
Explanations for how galaxies formed and evolved must be able to predict the observed properties and types of galaxies. Edwin Hubble created an early galaxy classification scheme, now known as the Hubble tuning-fork diagram. It partitioned galaxies into ellipticals, normal spirals, barred spirals (such as the Milky Way), and irregulars. These ...
Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae [1] and, as such, form part of the Hubble sequence. Most spiral galaxies consist of a flat, rotating disk containing stars , gas and dust , and a central concentration of stars known as the bulge .