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Hubble sequence

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The Hubble diagram is a pictoral representation of galaxy types developed by Edwin Hubble. It is also called the tuning-fork diagram as a result of its shape. Galaxy types are divided as follows:


/ SaSbSc
E0...E6S0 Ir
SBaSBbSBc

where E0 to E6 are elliptical galaxies, S0 is a transitional type, Sa to Sc are spiral galaxies, SBa to SBc are barred spiral galaxies, and Ir are irregular galaxies.

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