Planetary nebula
Add under discussion tag that points to gas or plasma discussion on talk page
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[[File:NGC 6326 by Hubble Space Telescope.jpg|thumb|[[NGC 6326]], a planetary nebula with glowing wisps of outpouring gas that are lit up by a binary{{harvnb|Miszalski|Jones|Rodríguez-Gil|Boffin|2011}} central star]] |
[[File:NGC 6326 by Hubble Space Telescope.jpg|thumb|[[NGC 6326]], a planetary nebula with glowing wisps of outpouring gas that are lit up by a binary{{harvnb|Miszalski|Jones|Rodríguez-Gil|Boffin|2011}} central star]] |
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A '''planetary nebula''' is a type of [[emission nebula]] consisting of an expanding, glowing shell of [[ionization|ionized]] gas ejected from [[red giant]] stars late in their lives.{{harvnb|Frankowski|Soker|2009|pp=654–8}} |
A '''planetary nebula''' is a type of [[emission nebula]] consisting of an expanding, glowing shell of [[ionization|ionized]] gas{{Under discussion inline|Gas or Plasma?}} ejected from [[red giant]] stars late in their lives.{{harvnb|Frankowski|Soker|2009|pp=654–8}} |
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The term "planetary nebula" is a [[misnomer]] because they are unrelated to [[planet]]s. The term originates from the planet-like round shape of these [[nebula]]e observed by astronomers through early telescopes. The first usage may have occurred during the 1780s with the English astronomer [[William Herschel]] who described these nebulae as resembling planets; however, as early as January 1779, the French astronomer [[Antoine Darquier de Pellepoix]] described in his observations of the [[Ring Nebula]], "very dim but perfectly outlined; it is as large as [[Jupiter]] and resembles a fading planet".{{cite book |
The term "planetary nebula" is a [[misnomer]] because they are unrelated to [[planet]]s. The term originates from the planet-like round shape of these [[nebula]]e observed by astronomers through early telescopes. The first usage may have occurred during the 1780s with the English astronomer [[William Herschel]] who described these nebulae as resembling planets; however, as early as January 1779, the French astronomer [[Antoine Darquier de Pellepoix]] described in his observations of the [[Ring Nebula]], "very dim but perfectly outlined; it is as large as [[Jupiter]] and resembles a fading planet".{{cite book |
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