Astronomers have detected the signal linked to a violent collision of two black holes that merged to form a gigantic black hole. “It’s the biggest bang since the Big Bang observed by humanity,” said Caltech physicist Alan Weinstein, who was part of the discovery team.

They are classified in two relative sizes, small, named after stellar black holes, formed when a star collapses and are approximately 5 miles in radius. And there are supermassive black holes potentially billions times bigger, around which entire galaxies revolve.

Previously, it was speculated that star collapses could only create stellar black holes more than 50 times the mass of our sun. In 2019 two detectors picked up a signal that was the merger of the two black holes, signifying each black hole was approximately 66 times the mass of our sun and the other was almost 85 times the mass. This was termed the first ever intermediate black hole, at 151 times the mass of the sun.

Contrary to this theory, research can’t quite explain how merged black holes, would collide with so many others to merge again. There is a possibility that supermassive black holes were formed in the immediate aftermath of the Big Bang.