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- Bok_globule abstract "In astronomy, Bok globules are isolated and relatively small dark nebulae, containing dense cosmic dust and gas from which star formation may take place. Bok globules are found within H II regions, and typically have a mass of about 2 to 50 solar masses contained within a region about a light year or so across (about 7047450000000000000♠4.5×1047 m3). They contain molecular hydrogen (H2), carbon oxides and helium, and around 1% (by mass) of silicate dust. Bok globules most commonly result in the formation of double or multiple star systems.Bok globules were first observed by astronomer Bart Bok in the 1940s. In a paper published in 1947, Bok and E.F. Reilly hypothesized that these clouds were \"similar to insect's cocoons\" that were undergoing gravitational collapse to form new stars from which stars and star clusters were born. This hypothesis was difficult to verify due to the observational difficulties of establishing what was happening inside a dense dark cloud that obscured all visible light emitted from within it. An analysis of near infrared observations published in 1990 confirmed that stars were being born inside Bok globules. Further observations have revealed that some Bok globules contain embedded warm sources, some contain Herbig–Haro objects, and some show outflows of molecular gas. Millimeter-wave emission line studies have provided evidence for the infall of material onto an accreting protostar.Bok globules are still a subject of intense research. Known to be some of the coldest objects in the natural universe, their structure and density remains somewhat a mystery. Methods applied so far have relied on column density derived from near infrared extinction and even star counting in a bid to probe these objects further.Bok globules that are irradiated by ultraviolet light from hot, nearby stars exhibit stripping of materials to produce a tail. These types are called \"cometary globules\" (CG).".
- Bok_globule thumbnail Bok_globules_in_IC2944.jpg?width=300.
- Bok_globule wikiPageExternalLink star_in_the_making.html.
- Bok_globule wikiPageID "1410775".
- Bok_globule wikiPageLength "7003".
- Bok_globule wikiPageOutDegree "34".
- Bok_globule wikiPageRevisionID "705313515".
- Bok_globule wikiPageWikiLink Astronomy.
- Bok_globule wikiPageWikiLink Barnard_68.
- Bok_globule wikiPageWikiLink Bart_Bok.
- Bok_globule wikiPageWikiLink Binary_star.
- Bok_globule wikiPageWikiLink Bipolar_outflow.
- Bok_globule wikiPageWikiLink CG_4.
- Bok_globule wikiPageWikiLink Carbon.
- Bok_globule wikiPageWikiLink Category:Dark_nebulae.
- Bok_globule wikiPageWikiLink Cosmic_dust.
- Bok_globule wikiPageWikiLink Dark_nebula.
- Bok_globule wikiPageWikiLink Extinction_(astronomy).
- Bok_globule wikiPageWikiLink File:Bok_globules_in_IC2944.jpg.
- Bok_globule wikiPageWikiLink Gravitational_collapse.
- Bok_globule wikiPageWikiLink H_II_region.
- Bok_globule wikiPageWikiLink Helium.
- Bok_globule wikiPageWikiLink Herbig–Haro_object.
- Bok_globule wikiPageWikiLink Hydrogen.
- Bok_globule wikiPageWikiLink IC_2944.
- Bok_globule wikiPageWikiLink Infrared.
- Bok_globule wikiPageWikiLink Light-year.
- Bok_globule wikiPageWikiLink Mass.
- Bok_globule wikiPageWikiLink Molecular_cloud.
- Bok_globule wikiPageWikiLink NGC_281.
- Bok_globule wikiPageWikiLink Orders_of_magnitude_(one_cubic_gigametre_and_greater).
- Bok_globule wikiPageWikiLink Protostar.
- Bok_globule wikiPageWikiLink Pupa.
- Bok_globule wikiPageWikiLink Solar_mass.
- Bok_globule wikiPageWikiLink Spectral_line.
- Bok_globule wikiPageWikiLink Star.
- Bok_globule wikiPageWikiLink Star_cluster.
- Bok_globule wikiPageWikiLink Star_formation.
- Bok_globule wikiPageWikiLink Visible_spectrum.
- Bok_globule wikiPageWikiLink File:NGC_281HSTFull.jpg.
- Bok_globule wikiPageWikiLinkText "Bok globule".
- Bok_globule wikiPageWikiLinkText "bok globule".
- Bok_globule wikiPageWikiLinkText "cometary globule".
- Bok_globule wikiPageWikiLinkText "globule".
- Bok_globule wikiPageWikiLinkText "globules".
- Bok_globule wikiPageUsesTemplate Template:Commons_category.
- Bok_globule wikiPageUsesTemplate Template:Nebula.
- Bok_globule wikiPageUsesTemplate Template:Reflist.
- Bok_globule wikiPageUsesTemplate Template:Star.
- Bok_globule wikiPageUsesTemplate Template:Star_formation.
- Bok_globule wikiPageUsesTemplate Template:Val.
- Bok_globule subject Category:Dark_nebulae.
- Bok_globule type Object.
- Bok_globule type Plasma.
- Bok_globule type Redirect.
- Bok_globule comment "In astronomy, Bok globules are isolated and relatively small dark nebulae, containing dense cosmic dust and gas from which star formation may take place. Bok globules are found within H II regions, and typically have a mass of about 2 to 50 solar masses contained within a region about a light year or so across (about 7047450000000000000♠4.5×1047 m3). They contain molecular hydrogen (H2), carbon oxides and helium, and around 1% (by mass) of silicate dust.".
- Bok_globule label "Bok globule".
- Bok_globule sameAs Q213936.
- Bok_globule sameAs كرة_بوك.
- Bok_globule sameAs Глобула,_астраномія.
- Bok_globule sameAs Glòbul_de_Bok.
- Bok_globule sameAs Bokovy_globule.
- Bok_globule sameAs Globule.
- Bok_globule sameAs Σφαιρίδιο_Bok.
- Bok_globule sameAs Glóbulo_de_Bok.
- Bok_globule sameAs گلبول_بوک.
- Bok_globule sameAs Globuli.
- Bok_globule sameAs Globule_de_Bok.
- Bok_globule sameAs Glóbulo_de_Bok.
- Bok_globule sameAs Bok-globula.
- Bok_globule sameAs Globulo_di_Bok.
- Bok_globule sameAs ボック・グロビュール.
- Bok_globule sameAs Mega_molekul.
- Bok_globule sameAs 보크_구상체.
- Bok_globule sameAs Globulen.
- Bok_globule sameAs Globulė_(astronomija).
- Bok_globule sameAs Глобула.
- Bok_globule sameAs Bolwolk.
- Bok_globule sameAs Bok-kule.
- Bok_globule sameAs Bok-kule.
- Bok_globule sameAs Globula_Boka.
- Bok_globule sameAs Glóbulo_de_Bok.
- Bok_globule sameAs m.04_9qf.
- Bok_globule sameAs Globulă_Bok.
- Bok_globule sameAs Глобула_(астрономия).
- Bok_globule sameAs Bokova_krogla.
- Bok_globule sameAs Bokove_globule.
- Bok_globule sameAs Bok-globul.
- Bok_globule sameAs กลุ่มเมฆบอก.
- Bok_globule sameAs Bart_damlacığı.
- Bok_globule sameAs Глобула_Бока.
- Bok_globule sameAs Q213936.
- Bok_globule sameAs 包克雲球.
- Bok_globule wasDerivedFrom Bok_globule?oldid=705313515.
- Bok_globule depiction Bok_globules_in_IC2944.jpg.
- Bok_globule isPrimaryTopicOf Bok_globule.