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| Description: Some Shapes of Planetary Nebulae (b) The Helix Nebula, NGC 7293, located in the constellation Aquarius, about 700 ly (215 pc) from Earth, has an angular diameter equal to about half that of the full Moon. Red gas is mostly hydrogen and nitrogen, whereas the blue gas is rich in oxygen. Picture Stats: Views: 585 Filesize: 104.48kB Height: 900 Width: 699 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=18603 |