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- Bok_globule abstract "Bok globules are dark clouds of dense cosmic dust and gas in which star formation sometimes takes 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 4.5 × 1047 m³, see Orders of magnitude (volume)). 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 also 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 blasted by nearby stars exhibit fragmentation 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 wikiPageRevisionID "600433164".
- Bok_globule hasPhotoCollection Bok_globule.
- Bok_globule subject Category:Dark_nebulae.
- Bok_globule subject Category:Nebulae.
- Bok_globule type Abstraction100002137.
- Bok_globule type Chemical114806838.
- Bok_globule type Compound114818238.
- Bok_globule type DarkNebulae.
- Bok_globule type Formulation114873641.
- Bok_globule type Material114580897.
- Bok_globule type Matter100020827.
- Bok_globule type Nebula114960606.
- Bok_globule type Nebulae.
- Bok_globule type Part113809207.
- Bok_globule type PhysicalEntity100001930.
- Bok_globule type Relation100031921.
- Bok_globule type Substance100019613.
- Bok_globule comment "Bok globules are dark clouds of dense cosmic dust and gas in which star formation sometimes takes 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 4.5 × 1047 m³, see Orders of magnitude (volume)). They contain molecular hydrogen (H2), carbon oxides and helium, and around 1% (by mass) of silicate dust.".
- Bok_globule label "Bok globule".
- Bok_globule label "Bolwolk".
- Bok_globule label "Globula Boka".
- Bok_globule label "Globule de Bok".
- Bok_globule label "Globule".
- Bok_globule label "Globulo di Bok".
- Bok_globule label "Glóbulo de Bok".
- Bok_globule label "Glóbulo de Bok".
- Bok_globule label "Глобула (астрономия)".
- Bok_globule label "كرة بوك".
- Bok_globule label "ボーク・グロビュール".
- Bok_globule label "包克雲球".
- Bok_globule sameAs Bokovy_globule.
- Bok_globule sameAs Globule.
- Bok_globule sameAs Σφαιρίδιο_Bok.
- Bok_globule sameAs Glóbulo_de_Bok.
- Bok_globule sameAs Globule_de_Bok.
- Bok_globule sameAs Globulo_di_Bok.
- Bok_globule sameAs ボーク・グロビュール.
- Bok_globule sameAs 보크_구상체.
- Bok_globule sameAs Bolwolk.
- Bok_globule sameAs Globula_Boka.
- Bok_globule sameAs Glóbulo_de_Bok.
- Bok_globule sameAs m.04_9qf.
- Bok_globule sameAs Q213936.
- Bok_globule sameAs Q213936.
- Bok_globule sameAs Bok_globule.
- Bok_globule wasDerivedFrom Bok_globule?oldid=600433164.
- Bok_globule depiction Bok_globules_in_IC2944.jpg.
- Bok_globule isPrimaryTopicOf Bok_globule.