The ripples in space-time generated by colliding black holes have taught us a lot about these enigmatic objects.
of two black holes, like ripples from a rock dropped into a pond. But they're also generated by the binary inspiral, and the intense gravitational interaction sends out weaker ripples as two black holes move inexorably closer.
"The shape and brevity – less than a tenth of a second – of the signal associated with the event lead us to hypothesize an instantaneous merger between two black holes, which occurred in the absence of a spiraling phase,"There's more than one way to end up with a pair of black holes gravitationally interacting.
The other is when two objects moving through space pass each other closely enough to get snagged gravitationally in what is known as a dynamical encounter.
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