
The ‘impossible’ merger of two massive black holes
Author: Mara Johnson-Groh, Simmons Foundation In 2023, astronomers detected a huge collision. Two unprecedentedly massive black holes had crashed an estimated 7 billion light-years away. The enormous masses and extreme spins of the black holes puzzled astronomers. Black holes like these were not supposed to exist. Now, astronomers with the Flatiron Institute’s Center for Computational […]








