The quantity of rouge black holes on the outskirt of Milky Way lies on the quantity of original galaxies congtaining centre black holes and the quantity of original galaxies to combined Milky Way.

• 银河系周围流氓黑洞的数量取决于有多少中心位置包含黑洞的原星系，以及多 少原星系合并形成银河系。