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Дата изменения: Mon Apr 10 10:52:31 2006
Дата индексирования: Tue Oct 2 17:45:11 2012
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Поисковые слова: barnard 68
Molecular Cloud <b style="color:black;background-color:#ffff66">Barnard</b> <b style="color:black;background-color:#66ffff">68</b>
Astronomy Picture of the Day
    


Molecular Cloud Barnard 68
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Molecular Cloud Barnard 68
Credit & Copyright: FORS Team, 8.2-meter VLT Antu, ESO
Explanation: Where did all the stars go? What used to be considered a hole in the sky is now known to astronomers as a dark molecular cloud. Here, a high concentration of dust and molecular gas absorb practically all the visible light emitted from background stars. The eerily dark surroundings help make the interiors of molecular clouds some of the coldest and most isolated places in the universe. One of the most notable of these dark absorption nebulae is a cloud toward the constellation Ophiuchus known as Barnard 68, pictured above. That no stars are visible in the center indicates that Barnard 68 is relatively nearby, with measurements placing it about 500 light-years away and half a light-year across. It is not known exactly how molecular clouds like Barnard 68 form, but it is known that these clouds are themselves likely places for new stars to form. It is possible to look right through the cloud in infrared light.

Lecture: APOD editor to give public talk in Princeton on April 11

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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
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NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Based on Astronomy Picture Of the Day

Publications with keywords: molecular cloud - Barnard 68
Publications with words: molecular cloud - Barnard 68
See also:
All publications on this topic >>