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Gravitational waves from colossal black holes found using 'cosmic clocks'
![An artist's rendering of gravitational waves emitted from a close-orbiting pair of ultra-massive black holes.](/news/mmg/media/images/NanoGrav Gravitational Wave Pulsar Explanation_f.jpg)
An artist's rendering of gravitational waves emitted from a close-orbiting pair of ultra-massive black holes.
Credit: Keyi "Onyx" Li/National Science Foundation
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