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- Dark_nebula abstract "A dark nebula is a type of interstellar cloud that is so dense that it obscures the light from the background emission or reflection nebula (e.g., the Horsehead Nebula) or background stars (e.g., the Snake Nebula). (The term absorption nebula has also been applied to these phenomenon.) The extinction of the light is caused by interstellar dust grains located in the coldest, densest parts of larger molecular clouds. Clusters and large complexes of dark nebulae are associated with Giant Molecular Clouds. Isolated small dark nebulae are called Bok globules. Like other interstellar dust/material, things it obscures are only visible using radio waves in radio astronomy or infrared in infrared astronomy.Dark clouds appear so because of submicrometre-sized dust particles, coated with frozen carbon monoxide and nitrogen, which effectively block the passage of light at visible wavelengths. Also present are molecular hydrogen, atomic helium, C18O, CS, NH3 (ammonia), H2CO (formaldehyde), c-C3H2 (cyclopropenylidene) and a molecular ion N2H+ (diazenylium), all of which are relatively transparent. These clouds are the spawning grounds of stars and planets, and understanding their development is essential to understanding star formation.The form of such dark clouds is very irregular: they have no clearly defined outer boundaries and sometimes take on convoluted serpentine shapes. The largest dark nebulae are visible to the naked eye, appearing as dark patches against the brighter background of the Milky Way like the Coalsack Nebula and the Great rift. These naked-eye objects are sometimes known as dark cloud constellations and take on a variety of names.In the inner outer molecular regions of dark nebula important events take place, such as the formation of stars and masers.".
- Dark_nebula wikiPageID "174823".
- Dark_nebula wikiPageRevisionID "605791343".
- Dark_nebula hasPhotoCollection Dark_nebula.
- Dark_nebula subject Category:Cosmic_dust.
- Dark_nebula subject Category:Dark_nebulae.
- Dark_nebula subject Category:Nebulae.
- Dark_nebula type Abstraction100002137.
- Dark_nebula type Chemical114806838.
- Dark_nebula type Compound114818238.
- Dark_nebula type DarkNebulae.
- Dark_nebula type Formulation114873641.
- Dark_nebula type Material114580897.
- Dark_nebula type Matter100020827.
- Dark_nebula type Nebula114960606.
- Dark_nebula type Nebulae.
- Dark_nebula type Part113809207.
- Dark_nebula type PhysicalEntity100001930.
- Dark_nebula type Relation100031921.
- Dark_nebula type Substance100019613.
- Dark_nebula comment "A dark nebula is a type of interstellar cloud that is so dense that it obscures the light from the background emission or reflection nebula (e.g., the Horsehead Nebula) or background stars (e.g., the Snake Nebula). (The term absorption nebula has also been applied to these phenomenon.) The extinction of the light is caused by interstellar dust grains located in the coldest, densest parts of larger molecular clouds.".
- Dark_nebula label "Absorptienevel".
- Dark_nebula label "Ciemna mgławica".
- Dark_nebula label "Dark nebula".
- Dark_nebula label "Dunkelwolke".
- Dark_nebula label "Nebulosa escura".
- Dark_nebula label "Nebulosa oscura".
- Dark_nebula label "Nebulosa oscura".
- Dark_nebula label "Nébuleuse obscure".
- Dark_nebula label "Тёмная туманность".
- Dark_nebula label "سديم مظلم".
- Dark_nebula label "暗星雲".
- Dark_nebula label "暗黒星雲".
- Dark_nebula sameAs Temná_mlhovina.
- Dark_nebula sameAs Dunkelwolke.
- Dark_nebula sameAs Nebulosa_oscura.
- Dark_nebula sameAs Nebulosa_ilun.
- Dark_nebula sameAs Nébuleuse_obscure.
- Dark_nebula sameAs Nebulosa_oscura.
- Dark_nebula sameAs 暗黒星雲.
- Dark_nebula sameAs 암흑성운.
- Dark_nebula sameAs Absorptienevel.
- Dark_nebula sameAs Ciemna_mgławica.
- Dark_nebula sameAs Nebulosa_escura.
- Dark_nebula sameAs m.017m3b.
- Dark_nebula sameAs Q204194.
- Dark_nebula sameAs Q204194.
- Dark_nebula sameAs Dark_nebula.
- Dark_nebula wasDerivedFrom Dark_nebula?oldid=605791343.
- Dark_nebula isPrimaryTopicOf Dark_nebula.