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| physical object > natural object > celestial body > nebula > H II region > gaseous nebula > N 159 | 
| N 159 comparison table | |||||
| Subject | is a kind of | is an instance of | has image | has definition | has distance | 
|---|---|---|---|---|---|
| gaseous nebula | H II region | 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. | |||
| N 159 | gaseous nebula | ![]()  | 170000 light years | 
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