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科学家首次发现银河系外行星存在的迹象
source link: http://tech.sina.com.cn/d/s/2018-02-18/doc-ifyrrmye2445166.shtml
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新华社北京2月17日电美国科学家近日借助“微引力透镜”效应，首次发现了银河系外行星存在的迹象。这批行星数量约有2000颗，远在38亿光年之外，质量大于月球、小于木星。人类发现的太阳系外行星已经数以千计，但都位于银河系内。其他星系离银河系至少
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