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直径约20万光年！银河系比之前认为的还要大
source link: https://tech.sina.com.cn/d/s/2018-07-10/doc-ihezpzwu4730775.shtml
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新浪科技讯北京时间7月10日消息，据国外媒体报道，一项新研究显示，银河系的星盘比我们此前预想的还要大。一艘宇宙飞船若以光速运行，需20万年才能穿越整个银河系。这一发现是在研究人员对恒星的金属重元素含量（又名金属丰度）进行分析后做出的。科学家
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