M2-9 Comparison Table

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physical object > natural object > celestial body > nebula > H II region > gaseous nebula > expanding emission nebula > planetary nebula > M2-9

Next planetary nebula: NGC 2346 Up: planetary nebula Previous planetary nebula: IC 3568

M2-9 comparison table

Subject has expansion velocity is a kind of is an instance of has image be part of has definition has distance

planetary nebula typically 10 km/s expanding 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.

M2-9 200 miles per second planetary nebula Ophiucus 2100 light years

Subject	has expansion velocity	is a kind of	is an instance of	has image	be part of	has definition	has distance
planetary nebula	typically 10 km/s	expanding 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.
M2-9	200 miles per second		planetary nebula		Ophiucus		2100 light years

Next planetary nebula: NGC 2346 Up: planetary nebula Previous planetary nebula: IC 3568