Bok globule | |
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![]() The Finger of God Globule in the Carina Nebula | |
Characteristics | |
Type | Isolated Dark nebulae |
Found | HII regions |
Mass range | 2M☉-50M☉ |
Chemical composition | Molecular hydrogen, carbon oxides, helium, and silicate dust |
Size range | ~1ly |
External links | |
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Additional Information | |
Discovered | Bart Bok, 1940s |
Star formation |
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Object classes |
Theoretical concepts |
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[1] to 50 solar masses contained within a region about a light year or so across (about 4.5×1047 m3).[2] They contain molecular hydrogen (H2), carbon oxides and helium, and around 1% (by mass) silicate dust. Bok globules most commonly result in the formation of double- or multiple-star systems.[3]
Bok globules such as Barnard 68 are only about half a light-year across and weigh in at about two solar masses
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