Exposures and filters: 70 minutes each of Ha and OIII (3nm); 10-minute subexposures for a total of 2hrs 20 min.
Color mapped by assigning Ha to red; OIII to blue and blending Ha+OIII for green.
FOV =24.3 x 16.1 arc minutes (75% of original)
M57 is a planetary nebula in the northern constellation of Lyra. Planetary nebulae form when a shell of ionized gas is expelled into the surrounding interstellar medium by a red giant star in its final stage of stellar evolution. M57 is illuminated by a central white drarf.
Located 2,300 light years away
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