更正：引力奇点是大爆炸宇宙论所说到的一个“点”，即“大爆炸”的起始点。奇点是英文中singular point翻译过来的，奇有两个读音，分别为“qí”和“jī”。经过请教天津市天文学会理事及其他专家，这里应该是奇异点的意思，因此读音为“qí”比较妥当，特此更正。在此特别感谢铁子_7a这位听友指出节目中的错误。在今后的节目中，主播会给大家提供更多更好的天文科普节目，欢迎各位听友收听指正。早在上个世纪，天文学家就已经注意到，银河系的中心有一个强大的无线电波源。此后，对银心中的一些特殊恒星运动的长期跟踪研究表明，那里有一个质量超过太阳400万倍的超大质量黑洞，它被称为人马座A*。据估计，这个黑洞的视界半径大约为1300万公里。既然银心中存在一个大型黑洞，为什么那里却非常明亮？
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