Hubble's Tuning Fork

This "tuning fork" is a model of classification of galaxies developed by Edwin Hubble. Hubble believed that this model was also an evolutionary sequence for galaxies, which we have found to be incorrect. He believed that all galaxies started out as E0 ellipticals and evolved into spirals, as the galaxy flattened out and developed arms. Astronomers have found today that instead, possibly that spiral galaxies sometimes merge to form elliptical galaxies (see the formation and evolution page ).

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These pages designed by Erin McNally (CU'00)... Last modified 19Apr00