The Hubble Tuning Fork Diagram
We've seen examples of all the Hubble galaxy types. Hubble went further to try and show the connectedness of these types by making a flow-chart, sometimes called a tuning fork because of its shape. This does NOT constitute an evolutionary sequence! It's based SOLELY on morphology..
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The frequency of galaxy types. We will find when we study CLUSTERS of galaxies, the ratio of Ellipticals to Spirals increases. Do Ellipticals more likely FORM in clusters or does the cluster environment evolve Spirals into Ellipticals? (nature verses nurture). Stay tuned. |