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The Atlantic Astronomers have discovered a black-hole treasure trove that is changing our view of the cosmos. MARK GARLICK / SCIENCE PHOTO LIBRARY / GETTY When the first black-hole collision was detected in 2015, it was a watershed moment in the history of astronomy. Using gravitational waves, astronomers were observing the universe in an entirely new way. But this first event didn’t revolutionize our understanding of black holes nor could it. This collision would be the first of many, astronomers knew, and only with that bounty would answers come. “The first discovery was the thrill of our lives,” says Vicky Kalogera, an astrophysicist at Northwestern University and part of the Laser Interferometer Gravitational-Wave Observatory (LIGO) collaboration that made the 2015 detection. “But you cannot do astrophysics with one source.”

Daniel holzMaya fishbachUniversity of chicagoBig bangFirst black hole collisionUnderstanding of black holesNew era of black hole astronomyBlack hole binary mergersNumber of black holesGravitational wavesBlack holesBlack hole merger dataBirth of the first starsFirst eventSample sizeTendency of many theorists