Gas on the inside of the Retina Nebula is ionized (or stripped of electrons) by light from the central star, and so it glows. Light from oxygen atoms is rendered blue in this image; hydrogen is shown as green, and nitrogen as red.
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Gas on the inside of the Retina Nebula is ionized (or stripped of electrons) by light from the central star, and so it glows. Light from oxygen atoms is rendered blue in this image; hydrogen is shown as green, and nitrogen as red. |
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