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美天文学家首次发现太阳系外也有“月球”的证据
source link: https://tech.sina.com.cn/d/s/2018-10-04/doc-ifxeuwws0951750.shtml
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新华社华盛顿10月3日电（记者周舟）美国天文学家首次发现强有力证据，表明太阳系外也存在“月球”——围绕行星的卫星。它距地球约8000光年，围绕一个巨大的气态行星旋转。3日发表在美国《科学进展》杂志上的论文显示，研究人员用开普勒太空望远镜和哈
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