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:

• Messier 57 (http://www.seds.org/messier/m/m057), SEDS Messier pages