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The biggest black hole smashup ever detected challenges physics theories

Gravitational waves reveal the birth of a black hole with about 225 times the mass of the sun

An image of space with two black holes on top warping the background image

Two black holes merged (illustrated) in the most massive collision of its type ever confirmed, physicists report.

VICTOR de SCHWANBERG/SCIENCE PHOTO LIBRARY

By Emily Conover

Talk about epic. A collision of two black holes is so extreme that it’s challenging physics theories of how large black holes form and merge.