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| Description: Comet Hale-Bopp In 1997, Comet Hale-Bopp had a hydrogen envelope 1 AU in diameter (blue ovals). This gas was observed in the ultraviolet. The visible light inset shows the scale of the visible tails Picture Stats: Views: 522 Filesize: 126.59kB Height: 900 Width: 898 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=18310 |