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- Cometary_knot abstract "Cometary knots are structures observed in several nearby planetary nebulae, including the Helix Nebula (NGC 7293), the Ring Nebula (NGC 6720), the Dumbbell Nebula (NGC 6853), the Eskimo Nebula (NGC 2392), and the Retina Nebula (IC 4406). It is believed that they are a common feature of the evolution of planetary nebulae, but can only be resolved in the nearest examples. They are generally larger than the size of the Solar system (i.e. the orbit of Pluto), with masses comparable to that of the Earth. The knots represent \"the ionized 'skin' of a dense, dusty molecular globule\" that forms a crescent-shaped structure where it is ionized and illuminated by the central star, with a trailing spoke or tail. The central globule is at least 1000 times denser than the surrounding material that streams past it. The appearance is analogous to the tail of a comet that faces away from its star, but comets are solid bodies and much smaller in overall size and mass.On the near side of the Helix Nebula, the central dusty globule of each cometary knot appears dark against the background of a central spherical shell that emits [O III] 5007 Angstrom light. Those on the far side do not obstruct this light source and so do not have this dark appearance.".
- Cometary_knot thumbnail Helix-nebula-detail-hubble.jpg?width=300.
- Cometary_knot wikiPageID "47741371".
- Cometary_knot wikiPageLength "5821".
- Cometary_knot wikiPageOutDegree "29".
- Cometary_knot wikiPageRevisionID "699186370".
- Cometary_knot wikiPageWikiLink Advection.
- Cometary_knot wikiPageWikiLink Bok_globule.
- Cometary_knot wikiPageWikiLink Category:Planetary_nebulae.
- Cometary_knot wikiPageWikiLink Category:Stellar_astronomy.
- Cometary_knot wikiPageWikiLink Champagne_flow.
- Cometary_knot wikiPageWikiLink Comet.
- Cometary_knot wikiPageWikiLink Coronagraph.
- Cometary_knot wikiPageWikiLink Doubly_ionized_oxygen.
- Cometary_knot wikiPageWikiLink Dumbbell_Nebula.
- Cometary_knot wikiPageWikiLink Earth.
- Cometary_knot wikiPageWikiLink Elephant_trunks.
- Cometary_knot wikiPageWikiLink Eskimo_Nebula.
- Cometary_knot wikiPageWikiLink H_II_region.
- Cometary_knot wikiPageWikiLink Helix_Nebula.
- Cometary_knot wikiPageWikiLink IC_4406.
- Cometary_knot wikiPageWikiLink NGC_6337.
- Cometary_knot wikiPageWikiLink Orion_Nebula.
- Cometary_knot wikiPageWikiLink Photoevaporation.
- Cometary_knot wikiPageWikiLink Planetary_nebula.
- Cometary_knot wikiPageWikiLink Plasma_recombination.
- Cometary_knot wikiPageWikiLink Pluto.
- Cometary_knot wikiPageWikiLink Proplyd.
- Cometary_knot wikiPageWikiLink R_Coronae_Borealis.
- Cometary_knot wikiPageWikiLink Ring_Nebula.
- Cometary_knot wikiPageWikiLink Solar_System.
- Cometary_knot wikiPageWikiLink White_dwarf.
- Cometary_knot wikiPageWikiLink Ångström.
- Cometary_knot wikiPageWikiLink File:Helix-nebula-detail-hubble.jpg.
- Cometary_knot wikiPageWikiLinkText "Cometary knot".
- Cometary_knot subject Category:Planetary_nebulae.
- Cometary_knot subject Category:Stellar_astronomy.
- Cometary_knot hypernym Structures.
- Cometary_knot type Building.
- Cometary_knot comment "Cometary knots are structures observed in several nearby planetary nebulae, including the Helix Nebula (NGC 7293), the Ring Nebula (NGC 6720), the Dumbbell Nebula (NGC 6853), the Eskimo Nebula (NGC 2392), and the Retina Nebula (IC 4406). It is believed that they are a common feature of the evolution of planetary nebulae, but can only be resolved in the nearest examples. They are generally larger than the size of the Solar system (i.e.".
- Cometary_knot label "Cometary knot".
- Cometary_knot wasDerivedFrom Cometary_knot?oldid=699186370.
- Cometary_knot depiction Helix-nebula-detail-hubble.jpg.
- Cometary_knot isPrimaryTopicOf Cometary_knot.