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| Description: Creation of Spiral and Elliptical Galaxies A galaxy begins as a huge cloud of primordial gas that collapses gravitationally. (a) If the rate of star birth is low, then much of the gas collapses to form a disk, and a spiral galaxy is created. (b) If the rate of star birth is high, then the gas is converted into stars before a disk can form, resulting in an elliptical galaxy. Picture Stats: Views: 651 Filesize: 368.93kB Height: 900 Width: 966 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=18796 |