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Ring Nebula
The Ring Nebula in Lyra, also known as M57 or NGC 6720 is the most famous example of a planetary nebula. Located at 0.7 kpc (2300 light-years) from us, the nebula is illuminated by a white dwarf of 15.8 visual magnitude. See also:
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Ring Nebula".