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Tuning-fork-style diagram of the Hubble sequence Galaxy morphological classification is a system used by astronomers to divide galaxies into groups based on their visual appearance. There are several schemes in use by which galaxies can be classified according to their morphologies, the most famous being the Hubble sequence , devised by Edwin ...
Tuning-fork style diagram of the Hubble sequence. The tuning fork scheme divided regular galaxies into three broad classes – ellipticals, lenticulars and spirals – based on their visual appearance (originally on photographic plates). A fourth class contains galaxies with an irregular appearance.
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...
Hubble tuning fork diagram of galaxy morphology. Because of the inability to conduct experiments in outer space, the only way to “test” theories and models of galaxy evolution is to compare them with observations. Explanations for how galaxies formed and evolved must be able to predict the observed properties and types of galaxies.
A 2012 paper that suggests a new classification system, first proposed by the Canadian astronomer Sidney van den Bergh, for lenticular and dwarf spheroidal galaxies (S0a-S0b-S0c-dSph) that parallels the Hubble sequence for spirals and irregulars (Sa-Sb-Sc-Im) reinforces this idea showing how the spiral–irregular sequence is very similar to ...
An unbarred lenticular galaxy is a lenticular version of an unbarred spiral galaxy. They have the Hubble type of SA0. An example of this is the galaxy AM 0644-741. For other examples, see Category:Unbarred lenticular galaxies.
A son who held his parent's alleged murderer at gunpoint is opening up about his final moments with his mother and father. T.D. Gribble recalled how he embraced his mom Paula, 76, and kissed the ...
Article incorrectly states that Hubble believed the Fork to be an evolutionary sequence. This is a myth, see the Wiki article for the Tuning Fork itself. — Preceding unsigned comment added by 130.113.172.251 ( talk ) 03:04, 25 May 2016 (UTC) [ reply ]