https://blog.wongcw.com/2021/09/02/%e9%9b%a2%e7%be%a4%e9%bb%91%e6%b4%9e%e5%8f%af%e8%83%bd%e5%9c%a8%e9%8a%80%e6%b2%b3%e7%b3%bb%e9%82%8a%e7%b7%a3%e5%be%98%e5%be%8a/
離群黑洞可能在銀河系邊緣徘徊