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| Description: Spiral Galaxies (Nearly Face-on Views) Edwin Hubble classified spiral galaxies according to the tightness of their spiral arms and the size of their central bulges. Sa galaxies have the largest central bulges and the most tightly wound spiral arms, whereas Sc galaxies have the smallest central bulges and the least tightly wound arms Picture Stats: Views: 682 Filesize: 108.95kB Height: 448 Width: 1350 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=18702 |