Space nebula

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Cat's Eye Nebula, Ring Nebula, Hubble Pictures, Spitzer Space Telescope, Planetary Nebula, Galaxy Photos, Helix Nebula, Mountain Landscape Photography, Astronomy Pictures

Messier 57 - The Ring Nebula Credit: NASA/ESA HST, Spitzer ST, Giuseppe Donatiello RA: 283,387° Dec: 33,026 The Ring Nebula (Messier 57 or NGC 6720) is a planetary nebula in Lyra and it is illuminated by a central white dwarf or planetary nebula nucleus (PNN) of 15.75 visual magnitude. All the interior parts of this nebula have a blue-green tinge that is caused by the doubly ionized oxygen emission lines at 495.7 and 500.7 nm. In the outer region of the ring, part of the reddish hue is…

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