Omega Nebula, also known as Swan Nebula, Checkmark Nebula, Horseshoe Nebula, Messier 17, M17, NGC 6618, Sharpless 45, RCW 160 and Gum 81, is an Interstellar Atomic Ionized Gas Cloud located inside The Sagittarius Constellation. Swan Nebula is located 5000 Light Years to 6000 Light Years from Earth. Checkmark Nebula has a mass of 800 Solar Masses and a radius of 11 Light Years. Gum 81 was discovered in 1745 by Swiss Astronomer Philippe Loys de Chéseaux.
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