Rare trio of supermassive black holes found
Observations of triad showcase new way to find black hole pairs
THREE’S A CROWD Three supermassive black holes, seen in an artist’s illustration, include two only 450 light-years apart (blue), with electron jets streaming out in spirals. The third black hole (red) sits 24,000 light-years away and produces straight jets.
R. Deane, NASA Goddard