The blue-green glow in the center comes from oxygen atoms shining under effects of the intense ultraviolet radiation of the central star and the hot gas. Further out from the star and beyond the ring of knots, the red color from hydrogen and nitrogen domi
The blue-green glow in the center comes from oxygen atoms shining under effects of the intense ultraviolet radiation of the central star and the hot gas. Further out from the star and beyond the ring of knots, the red color from hydrogen and nitrogen domi
The blue-green glow in the center comes from oxygen atoms shining under effects of the intense ultraviolet radiation of the central star and the hot gas. Further out from the star and beyond the ring of knots, the red color from hydrogen and nitrogen domi
The blue-green glow in the center comes from oxygen atoms shining under effects of the intense ultraviolet radiation of the central star and the hot gas. Further out from the star and beyond the ring of knots, the red color from hydrogen and nitrogen domi