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研究称人类是来自银河系外“移民”

2017-07-31 10:52:19   参考消息

参考消息网7月30日报道 英媒称,一项新研究认为,形成人类的物质来自万亿英里外的另一个星系。

据英国《独立报》网站7月29日报道,这项研究称,我们身边以及银河系里的很多东西都由“银河系外的物质”构成。

这项研究通过计算机模型发现我们身边的物质怎样被银河系获取。研究发现,超新星爆炸把大量物质从星系中抛出,强大的星系风把这些物质扩散到宇宙各处。

报道称,这意味着构成我们人类的物质,很可能在极度遥远的过去和极度遥远的地方就已经诞生,后来才穿过漫漫宇宙来到这里。

西北大学天体物理学中心博士后研究生丹尼尔·安格莱斯·阿尔卡扎说:“鉴于构成人类的物质有那么多都来自其他星系,我们可以把自己视为太空旅客或银河系外的移民。”他说:“银河系中的很多物质可能之前都在其他星系,后来被强风吹散,穿行于星际,最终在银河系安家。”星际迁移,也就是物质在星系之间的这种运动,是一种新识别的现象,可能最终改变我们对星系形成的理解。

研究报告的共同作者福谢·吉格尔说:“这项研究彻底改变了我们对星系如何形成于大爆炸的认识。”

他说:“这种新的模式显示,我们周遭(包括太阳系、地球上以及我们每个人身上)的原子,有一半之多并非来自我们自己的星系,而是来自其他星系,有100万光年那么远。”

报道称,即便物质以每秒数百公里的速度传播,这么遥远的距离也意味着它们要走几十亿年。

科学家们依靠相当于数百万小时的计算,模拟物质在宇宙当中的运动以开展此项研究。他们勾勒出宇宙在大爆炸之初的详细图像,然后通过计算机模拟宇宙的运动,直到今天的样子。

模拟显示,物质是从较小的星系迁移到较大的星系,比如我们的银河系。这些气体后来形成恒星,在像我们银河系这样的星系中有多达50%的物质都是这么形成的。

宇宙在形成之初充斥着单一气体,没有我们今天认识或居住的这种恒星或星系。但是,随着时间的推移,轻微的扰动使物质聚在一起,这种效果因为引力而加速,最终形成星系,并围绕一个巨大的中心运行。

责任编辑:孙启浩 CN037
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