These monster black holes did not form the usual way—their history of violence is written into spacetime ripples - Phys.org

1. These monster black holes did not form the usual way—their history of violence is written into spacetime ripples  Phys.org
2. How do the biggest black holes in the universe form? Ripples in spacetime provide a clue  Space
3. Gravitational-wave constraints on the pair-instability mass gap and nuclear burning in massive stars  Nature
4. The Universe’s biggest black holes may be forged in violent mergers  ScienceDaily
5. Giant black holes are cosmic ‘Frankensteins’ built by mergers, new study reveals  The News International