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| Description: The Rotation Curves of Four Spiral Galaxies This graph shows how the orbital speed of material in the disks of four spiral galaxies varies with the distance from the center of each galaxy. If most of each galaxy’s mass were concentrated near its center, these curves would fall off at large distances. But these and many other galaxies have flat rotation curves that do not fall off. This indicates the presence of extended halos of dark matter. Picture Stats: Views: 586 Filesize: 180.42kB Height: 900 Width: 1264 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=18739 |