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Old 31-01-2016, 01:20 AM
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Thumbs up 宇宙显示天意吉兆!蔡英文败战投降,台湾回归中国!大吉大利!猴年&a

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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