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The Ring Nebula (also known as NGC 6720) is a planetary nebula in the northern constellation of Lyra. Such objects are formed when a shell of ionized gas is expelled into the surrounding interstellar medium by a red giant star, which was passing through the last stage in its evolution before becoming a white dwarf.
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Images by Gordon Collins
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Images by Martin Crow
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Images by Simon Dawes
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Images by Debra Holton
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Images by Keith Rickard
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Images by David Sheehan
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Images by Julian Tworek
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Images by Andrew Wilson
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