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广义相对论被证实！天文学家首次发现光线被黑洞拉伸
source link: https://tech.sina.com.cn/d/s/2018-07-30/doc-ihfxsxzh8669522.shtml
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来源：中国科学报天文学家在银河系中央捕捉到将恒星释放的光线拉长的巨大黑洞。这是他们追踪该恒星近30年后发现的。根据爱因斯坦的广义相对论，光线在强引力场作用下会出现拉伸现象，波长变长，向红波方向偏移，这被称为引力红移效应。但时至今日，它从未在
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