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Hunting for Pairs of Monster Black Holes

When two galaxies merge, the supermassive black holes at their centres should eventually find each other and begin a gravitational dance that lasts millions of years. Despite decades of predictions, astronomers are still hunting for definitive proof these binary systems exist. A new review examines the clues scattered across the universe, from wobbling jets spanning hundreds of thousands of light years to specific spectral signatures, and explores why finding these black hole pairs matters for understanding both the past and future of our own Galaxy.

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