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Spiral galaxy UGC 12591 is classified as an S0/Sa galaxy. [1]The Hubble sequence is a morphological classification scheme for galaxies invented by Edwin Hubble in 1926. [2] [3] It is often known colloquially as the “Hubble tuning-fork” because of the shape in which it is traditionally represented.
As one of the first steps towards a coherent theory of galaxy evolution, the American astronomer Edwin Hubble, developed a classification scheme of galaxies in 1926. Although this scheme, also known as the Hubble tuning fork diagram, is now considered somewhat too simple, the basic ideas still hold...
The Pinwheel Galaxy (Messier 101/NGC 5457): a spiral galaxy classified as type Scd on the Hubble sequence The barred spiral galaxy NGC 1300: a type SBbc See also: Spiral galaxy On the right of the Hubble sequence diagram are two parallel branches encompassing the spiral galaxies .
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The Oldest Galaxy Yet Found; Galaxy classification project, harnessing the power of the internet and the human brain; How many galaxies are in our Universe? Archived 2015-08-21 at the Wayback Machine; 3-D Video (01:46) – Over a Million Galaxies of Billions of Stars each – BerkeleyLab/animated.
The Hubble classification of elliptical galaxies contains an integer that describes how elongated the galaxy image is. The classification is determined by the ratio of the major (a) to the minor (b) axes of the galaxy's isophotes: Thus for a spherical galaxy with a equal to b, the number is 0, and the Hubble type is E0.
Messier 83 is an intermediate spiral galaxy of type SABc located in the constellation Hydra. An intermediate spiral galaxy is a galaxy that is in between the classifications of a barred spiral galaxy and an unbarred spiral galaxy. It is designated as SAB in the galaxy morphological classification system devised by Gerard de Vaucouleurs. [1]