Ring Nebula Comparison Table

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Ring Nebula comparison table

Subject has purpose has expansion velocity is part of is a kind of has catalog is an instance of has synonym has illuminating star has image has definition has distance has composition has Messier number

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

planetary nebula typically 10 km/s gas expanding emission nebula planetary nebula catalog emission nebula An expanding envelope of rarefied ionized gas surrounding a hot white dwarf. The envelope receives ultraviolet radiation from the central star and reemits it as visible light by the process of fluorescence. The planetary nebula stage lasts for less than 50,000 years. During the core contraction that terminates the red-giant stage, the helium-burning shell is ejected at a velocity so high that it becomes separated from the core. Under current theories, a star with a carbon core and a mass greater than 0.6 M_sun (but less than 4 M_sun) will become a planetary nebula and leave behind a white dwarf. Planetary nebulae are now known to occur in stars less than 4 M_sun whose envelope becomes unstable during the hydrogen shell burning stage. enhanced with heavy elements relative to the interstellar medium

Ring Nebula originally to catalog all objects which could be confused with a comet typically 10 km/s gas planetary nebula catalog Messier object M 57 A famous planetary nebula (M57, NGC 6720) in the constellation Lyra. 2000 light years enhanced with heavy elements relative to the interstellar medium 57

Subject	has purpose	has expansion velocity	is part of	is a kind of	has catalog	is an instance of	has synonym	has illuminating star	has image	has definition	has distance	has composition	has Messier number
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
planetary nebula		typically 10 km/s	gas	expanding emission nebula	planetary nebula catalog		emission nebula			An expanding envelope of rarefied ionized gas surrounding a hot white dwarf. The envelope receives ultraviolet radiation from the central star and reemits it as visible light by the process of fluorescence. The planetary nebula stage lasts for less than 50,000 years. During the core contraction that terminates the red-giant stage, the helium-burning shell is ejected at a velocity so high that it becomes separated from the core. Under current theories, a star with a carbon core and a mass greater than 0.6 M_sun (but less than 4 M_sun) will become a planetary nebula and leave behind a white dwarf. Planetary nebulae are now known to occur in stars less than 4 M_sun whose envelope becomes unstable during the hydrogen shell burning stage.		enhanced with heavy elements relative to the interstellar medium
Ring Nebula	originally to catalog all objects which could be confused with a comet	typically 10 km/s	gas		planetary nebula catalog	Messier object	M 57			A famous planetary nebula (M57, NGC 6720) in the constellation Lyra.	2000 light years	enhanced with heavy elements relative to the interstellar medium	57

Next Messier object: Sombrero galaxy Up: Messier object, planetary nebula Previous Messier object: Praesepe