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physical object > natural object > celestial body > Messier object > Omega Nebula

Omega Nebula comparison table

Subject	has purpose	is part of	is a kind of	has catalog	is an instance of	has synonym	has image	has definition	has distance	has discoverery date	has discoverer	has composition	has Messier number
gaseous nebula		gas	H II region	gaseous nebula catalog		emission nebula		An H II region, a supernova remnant, or a planetary nebula. H II regions have an emission-line optical spectrum, and a thermal continuous spectrum declining in intensity as the wavelength increases (from maximum in the ultraviolet) through infrared and radio. Supernova remnants have an emission-line optical spectrum and a nonthermal radio spectrum. Temperatures of planetary nebulae are much higher than those of H II regions.				ionized hydrogen
Messier object	originally to catalog all objects which could be confused with a comet	celestial sphere	celestial body	Messier catalog				an object assigned a number by Charles Messier	from Earth
Omega Nebula	originally to catalog all objects which could be confused with a comet	gas		gaseous nebula catalog	Messier object	NGC 6618		A bright H II region. It is a double radio source.	from Earth	1745	Philippe Loys de Cheseaux	ionized hydrogen	17

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