Main Page | See live article | Alphabetical index 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: Messier 57, SEDS Messier pages This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.