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| Description: As light travels away from any object, the light rays, all moving in straight lines, separate. By the time light has traveled trillions of kilometers, only the light rays moving in virtually parallel tracks are still near each other. Picture Stats: Views: 711 Filesize: 75.8kB Height: 900 Width: 592 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=15870 |