The Ring Nebula, also known as M57, is a planetary nebula in the northern constellation of Lyra.
This nebula was discovered by the French astronomer Charles Messier while searching for comets in late January 1779.
M57 is found south of the bright star Vega, which forms the northwestern vertex of the Summer Triangle asterism.
All the interior parts of this nebula have a blue-green tinge that is caused by the doubly ionized oxygen emission lines.
Image Credit: Hubble, Large Binocular Telescope, Subaru Telescope; Composition & Copyright: Robert Gendler
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