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

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.

The merger wasn’t just the biggest ever, but also an event so rare that it challenges existing models for black hole genesis.