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Old 31-01-2016, 01:00 AM
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An honorable member of the Coffee Shop Has Just Posted the Following:

http://news.xinhuanet.com/tech/2016-...1117944937.htm

天文学家发现一巨大云团高速回归银河系
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2016年01月30日 18:21:39 来源: 新华社

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  新华社华盛顿1月29日电(记者林小春)叶落归根,可能也适用于宇宙中一些由气体与尘埃组 成的巨大云团 。美国研究人员最近利用哈勃天文望远镜观测发现,一个被称为“史密斯云”的氢云团在“离家出走 ”约7000 万年后,正以每小时近113万公里的高速回归银河系。

  “史密斯云”上世纪60年代由一名叫盖尔·史密斯的天文学博士生首先发现,主要由氢气组成 ,外形很像彗 星,长1.1万光年,宽2500光年。天文学家曾猜测,它可能来自于星际空间或没有恒星的星系 ,不存在造星 的较重元素。

  但最新观测发现,“史密斯云”中有硫元素,含量与银河系外层尘埃盘的硫含量相当。这说明, “史密斯云” 本来就在银河系中形成,现在实际上只是在回“家”路上,要回到它的诞生之地。

  美国太空探测科学研究所的安德鲁·福克斯等人在新一期《天体物理学杂志通讯》中报告说,据 估算,正在以 近113万公里时速“赶路”的“史密斯云”,将在约3000万年后冲撞银河系,引发造星的大爆 炸,所提供的 气体可能足以形成200万个太阳。

  “这个云团是星系随着时间推移而变化的一个实例,”福克斯在一份声明中写道,“它告诉我们 ,银河系是一 个非常活跃的地方,气体从它尘埃盘的一个地方抛出,然后又回到它尘埃盘的另外一个地方。我们的 银河系通过云 团来回收它的气体,并在与以前不同的地点造星”。

  研究人员指出,最新发现解决了“史密斯云”的出生之谜,但也提出了新问题,如导致“史密斯 云”“离家出 走”的事件是什么?它是怎么“跑”到现在这个位置的?又怎么让自身完好无损地保存至现在?这些 问题需要进一 步研究加以解答。


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