Astrophysicists have analyzed two merging black holes; the team's best models suggest that at least one, if not both, of the black holes shouldn't exist.

Scientists measure largest ever collision of two black holes - Scientists say the two black holes merged after colliding at speeds near the limit allowed by Albert Einstein’s theory of general relativ

A collision observed between two black holes, each more massive than a hundred suns, is the largest merger of its kind ever recorded, according to new research.