Astronomy View all facts Glossary Help |
physical object > natural object > celestial body > nebula > H II region > gaseous nebula > North America Nebula |
North America Nebula comparison table |
Subject | has definition | has synonym | is a kind of | is an instance of |
---|---|---|---|---|
gaseous 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. | emission nebula | H II region | |
North America Nebula | An emission nebula in Cygnus. | NGC 7000 | gaseous nebula |
Next gaseous nebula: Omega Nebula Up: gaseous nebula Previous gaseous nebula: NGC 604