Science
Ways to detect merging black holes in addition to gravitational waves – Phys.org
If two black holes merge in the middle of space, and nobody’s around to see it, does it really happen?

If two black holes merge in the middle of space, and nobody’s around to see it, does it really happen?
To date, the only way astronomers have conclusively witnessed the merging of black holes is through their emission of gravitational wavessubtle ripples…
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