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http://www.astro.princeton.edu/~frei/Gcat_htm/cat_ims.htm Princeton runs the site. We had to do a series of modules that had us by shape and number of stars, identify the classification of a galaxy.
In 1926, an astronomer named Edwin Hubble decided to classify the galaxies, grouping them according to some logical scheme. He could have classified them according to color, because galaxies are different colors. He could have classified them according to size, calling small galaxies "dwarf galaxies" and calling large galaxies "massive galaxies". After considering different schemes, he decided to arrange or group them by shapes. He would classify them according to the way they looked. In science, the study of something according to its form or structure is called "morphology". Most galaxies are elliptical. Some elliptical galaxies are nearly circular in shape. Some elliptical galaxies are extremely stretched out, flattened,or elongated. To deal with this variation, Hubble divided the......

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