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physical object > naked eye object > Orion Nebula

Orion Nebula comparison table

Subject	has purpose	has illuminating star(s)	is part of	is a kind of	has catalog	is an instance of	has synonym	has image	has definition	has distance	has age	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
naked eye object				physical object					a physical object visible to the unnaided human eye
Orion Nebula	originally to catalog all objects which could be confused with a comet	trapezium	gas		gaseous nebula catalog	Messier object	M 42		The Orion Nebula, a star-forming region in the constellation Orion.	500 pc	20000 years	ionized hydrogen	42

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