The Omega Nebula (Swan Nebula or M17) is an H II region between 5000 and 6000 ly away in Sagittarius. An open star cluster lies embedded in the nebulosity and, due to radiation, causes the gases of the nebula to shine

 
The Omega Nebula (Swan Nebula or M17) is an H II region between 5000 and 6000 ly away in Sagittarius. An open star cluster lies embedded in the nebulosity and, due to radiation, causes the gases of the nebula to shine

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