Tuning Fork Diagram
A system of classification for elliptical, spiral and irregular galaxies.
Turnoff Point ...
The number next to the ``E'' in the tuning fork diagram = 10×(largest diameter - smallest diameter) / (largest diameter), so an E7 galaxy is flatter than an E0 galaxy.
The Leo Triplet are a varied bunch of spiral galaxies, covering several categories on Edwin Hubble's tuning fork diagram, which describes the shapes of different types of galaxies.
The Hubble Tuning fork diagram showing the different forms that galaxies come in. The main groups are the ellipticals, the spirals and the barred spirals. A transitional form is the Lenticular type (labeled S0).
Galaxies are classified according to their structural properties, as can be seen on the Tuning Fork Diagram, originally drawn by Edwin Hubble in the early 1900s.
The origin of the term 'late-type' lies with the original interpretation of the Hubble tuning fork diagram. This assumed that galaxies evolved from the left (early-type ellipticals) to the right (late-type spirals) in a sequence.
He further divided the spirals into regular spirals and barred spirals -- spiral galaxies whose central bulges were replaced by a bar-like structure. These three distinct types made up Hubble's tuning fork diagram -- the ellipticals made up the ...
 See also: Galaxy, Galaxies, Chara, Cluster, Universe
  
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