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The recent discovery of gravity wave collisions has led to the realization that these collisions are surprisingly frequent: two-body problems are sufficiently stable, even under general relativity, that pairs of black holes should continue orbiting around each other for eons rather than crashing. As Quanta describes (https://www.quantamagazine.org/to-make-two-black-holes-collide-try-three-20190815/) one possible resolution is to add a third black hole to the mix, and get a (significantly less stable) three-body problem.