质量大的星体向核心无穷塌縮最终成黑洞,密度不大吗?-----his original message. I think he was trying to consider the mean density but not 'a small part of black hole'
其實无穷也不一定錯----ur original message. In my point of view, that means infinity gravitational collapse may happen in some cases.
and...what's wrong with the singularity?