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来自维基教科书，一个开放世界的开放教科书
这是
最新审核版本
，
已在
2016年3月20日
审核通过。
我们宇宙中的黑洞/Wikijunior：黑洞
文件：Sgr lg.png
银河中心的黑洞：人马座 A
隐藏分类
包含损坏的文件链接的页面
华夏公益教科书
