分子云巴纳德 68

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每日天文一图 (天之星天文论坛)
Astronomy Picture of the Day
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

探索宇宙! 每天发布一张有专业天文学家的简短解释和说明的反映我们迷人宇宙的不同影像或照片。


2006 年 04 月 09 日



2006 April 9


http://antwrp.gsfc.nasa.gov/apod/image/0604/barnard68_vlt_big.jpg

Molecular Cloud Barnard 68
分子云巴纳德 68
Credit: FORS Team, 8.2-meter VLT Antu, ESO

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.


星星都去哪了？在过去那曾经被认为是天空的一个空白区域已被天文学家认知为一个暗分子云。在这里，一个高密度的尘埃和分子气体差不多把所有从背景恒星发出可见光都吸收了。这个诡异暗分子云的内部，可能是宇宙中最阴冷且最孤独的地方之一。上图蛇夫座的巴纳德68是有名的暗分子云之一。在星云中心几乎看不到恒星表明了巴纳德68离我们不远，测量表明它大约离我们500光年远和半光年的直径。现在还不很确切的知道像巴纳德68一样的分子云是如何形成的，但是知道这些云可能是新恒星形成的地方。我们可以用红外光透视这类云气，一窥星云内部的状态。( 蛇夫座 -- Ophiuchus, 分子云巴纳德68 -- molecular cloud Barnard 68)
[翻译：夜空]

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翻译得不错，加分了！