File:Hubble_Tuning_Fork_diagram.svg · Wikimedia Commons · See Wikimedia Commons
Hubble sequence
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morphological classification scheme for galaxies invented by Edwin Hubble
~12 min read
Encyclopedic overview
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
Excerpted from Wikipedia’s “Hubble sequence” article, available under the CC BY-SA 4.0 licence.