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- Planetary_nebula abstract "A planetary nebula, often abbreviated as PN or plural PNe, is a kind of emission nebula consisting of an expanding glowing shell of ionized gas ejected from old red giant stars late in their lives. The word 'nebula' is Latin for mist or cloud and the term 'planetary nebula' is a misnomer that originated in the 1780s with astronomer William Herschel because when viewed through his telescope, these objects appeared to him to be newly forming planetary systems. Herschel's name for these objects was adopted by astronomers and has not been changed. They are a relatively short-lived phenomenon, lasting a few tens of thousands of years, compared to a typical stellar lifetime of several billion years.A mechanism for formation of most planetary nebulae is thought to be the following: at the end of the star's life, during the red giant phase, the outer layers of the star are expelled via pulsations and strong stellar winds. The exposed hot, luminous core emits ultraviolet radiation that ionizes the ejected outer layers of the star. This energized shell of nebulous gas reradiates the absorbed ultraviolet energy at visible frequencies and appears as a planetary nebula.Planetary nebulae may play a crucial role in the chemical evolution of the galaxy, returning material to the interstellar medium from stars where heavy elements, the products of nucleosynthesis (such as carbon, nitrogen, oxygen and calcium), have been created. In more distant galaxies, planetary nebulae may be the only objects that can be resolved and yield useful information about chemical abundances.In recent years, Hubble Space Telescope images have revealed many planetary nebulae to have extremely complex and varied morphologies. About one-fifth are roughly spherical, but the majority are not spherically symmetric. The mechanisms which produce such a wide variety of shapes and features are not yet well understood, but binary central stars, stellar winds and magnetic fields may play a role.".
- Planetary_nebula thumbnail NGC6543.jpg?width=300.
- Planetary_nebula wikiPageExternalLink ?id=7NfqpZxO_o0C.
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- Planetary_nebula wikiPageExternalLink ?id=kd4VEZv8oo0C&dq.
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- Planetary_nebula wikiPageExternalLink ?id=uRgWHDGpKZIC.
- Planetary_nebula wikiPageExternalLink ?id=xxVkZBVIZeAC.
- Planetary_nebula wikiPageExternalLink index.html.
- Planetary_nebula wikiPageExternalLink background.
- Planetary_nebula wikiPageExternalLink planetar.html.
- Planetary_nebula wikiPageExternalLink chap1.pdf.
- Planetary_nebula wikiPageExternalLink planneb.html.
- Planetary_nebula wikiPageExternalLink planetary_nebulae.
- Planetary_nebula wikiPageExternalLink planetar.html.
- Planetary_nebula wikiPageExternalLink stellar-chemistry-05a.html.
- Planetary_nebula wikiPageExternalLink heic1316a.pdf.
- Planetary_nebula wikiPageExternalLink theme3.py?level=1&index1=38478.
- Planetary_nebula wikiPageID "39674".
- Planetary_nebula wikiPageRevisionID "603786798".
- Planetary_nebula hasPhotoCollection Planetary_nebula.
- Planetary_nebula subject Category:Planetary_nebulae.
- Planetary_nebula subject Category:Stellar_evolution.
- Planetary_nebula comment "A planetary nebula, often abbreviated as PN or plural PNe, is a kind of emission nebula consisting of an expanding glowing shell of ionized gas ejected from old red giant stars late in their lives. The word 'nebula' is Latin for mist or cloud and the term 'planetary nebula' is a misnomer that originated in the 1780s with astronomer William Herschel because when viewed through his telescope, these objects appeared to him to be newly forming planetary systems.".
- Planetary_nebula label "Mgławica planetarna".
- Planetary_nebula label "Nebulosa planetaria".
- Planetary_nebula label "Nebulosa planetaria".
- Planetary_nebula label "Nebulosa planetária".
- Planetary_nebula label "Nébuleuse planétaire".
- Planetary_nebula label "Planetaire nevel".
- Planetary_nebula label "Planetarischer Nebel".
- Planetary_nebula label "Planetary nebula".
- Planetary_nebula label "Планетарная туманность".
- Planetary_nebula label "سديم كوكبي".
- Planetary_nebula label "惑星状星雲".
- Planetary_nebula label "行星状星云".
- Planetary_nebula sameAs Planetární_mlhovina.
- Planetary_nebula sameAs Planetarischer_Nebel.
- Planetary_nebula sameAs Πλανητικό_νεφέλωμα.
- Planetary_nebula sameAs Nebulosa_planetaria.
- Planetary_nebula sameAs Nébuleuse_planétaire.
- Planetary_nebula sameAs Nebula_planeter.
- Planetary_nebula sameAs Nebulosa_planetaria.
- Planetary_nebula sameAs 惑星状星雲.
- Planetary_nebula sameAs 행성상성운.
- Planetary_nebula sameAs Planetaire_nevel.
- Planetary_nebula sameAs Mgławica_planetarna.
- Planetary_nebula sameAs Nebulosa_planetária.
- Planetary_nebula sameAs m.09wv4.
- Planetary_nebula sameAs Q13632.
- Planetary_nebula sameAs Q13632.
- Planetary_nebula wasDerivedFrom Planetary_nebula?oldid=603786798.
- Planetary_nebula depiction NGC6543.jpg.
- Planetary_nebula isPrimaryTopicOf Planetary_nebula.
