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【美图共赏09-06-23】黑暗分子云巴纳德68

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发表于 2009-6-23 21:04 | 显示全部楼层 |阅读模式
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2009 June 23



Molecular Cloud Barnard 68
Credit: 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. In fact, Barnard 68 itself has recently been found likely to collapse and form a new star system. It is possible to look right through the cloud in infrared light.
 楼主| 发表于 2009-6-23 21:05 | 显示全部楼层
黑暗分子云巴纳德68

说明:这些恒星全都去哪儿了?我们曾认为这是天空中的一个孔洞,而现在,天文学家知道这是一片黑暗的分子云。在这里,一团高密度的尘埃分子气体云吸收了背景恒星发出的所有可见光。周围物质的极端黑暗使这团分子云的内部变成了宇宙中最寒冷、最与世隔绝的地方。这类暗吸收星云里最著名的一个就是蛇夫座的巴纳德68,如上图所示。巴纳德68的中央看不到任何恒星,这表明它距离我们比较近——经测量,它位于500光年之外,跨度为半光年。巴纳德68这样的分子云如何形成,我们还不能完整解释,但是我们知道这些分子云本身就可能是新生恒星的诞生之地。实际上,我们最近已经发现,巴纳德68自身可能会坍缩成一个新的恒星系统。或许在红外线波段,我们能够看穿这片星云。 (译/小月)

[ 本帖最后由 月下美丽的梦 于 2009-6-23 21:22 编辑 ]

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