Hubble sequence
Also known as Hubble classification
morphological classification scheme for galaxies invented by Edwin Hubble
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The Hubble sequence is a morphological classification scheme for galaxies published by Edwin Hubble in 1926. It is often colloquially known as the Hubble tuning-fork diagram because the shape in which it is traditionally represented resembles a tuning fork. It was invented by John Henry Reynolds and Sir James Jeans.
Tuning-fork style diagram of the Hubble sequence