Sky & Telescope. because colliding black holes don’t give off any light, you wouldn’t expect any optical counterpart. de Mink, S.E.; King, A. (April 2017).
Sky & Telescope. because colliding black holes don’t give off any light, you wouldn’t expect any optical counterpart.  ^ de Mink, S.E.; King, A. (tháng 4 năm 2017).