Veil Nebula in O-III light only, Metsavainio
Veil Nebula in O-III light only, Metsavainio

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This photo of the Veil Nebula supernova remnant in Cygnus shows only an emission from the ionized oxygen (O-III). All the stars are suppressed to show the actual shapes of the ionization front better.

The ionized oxygen, O-III, glows at wavelength of 500,7 nanometer. To a human eye it shows as a turquoise color.

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Veil Nebula in O-III light only, Metsavainio