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| Description: History of Quasar Formation The greater the redshift of a quasar, the farther it is from Earth and the farther back in time we are seeing it. By observing the number of quasars found at different redshifts, astronomers can calculate how the density of quasars has changed over time Picture Stats: Views: 605 Filesize: 189.23kB Height: 900 Width: 1093 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=18755 |