Merging black holes ripple space and time in this artist's concept. Pulsar-timing arraysnetworks of the pulsing cores of dead starsare one strategy for detecting these ripples, or gravitational waves, thought to be generated when two supermassive black
Credit: Swinburne Astronomy Productions
Throughout our universe, tucked inside galaxies far, far away, giant black holes are pairing up and merging.
From Jet Propulsion Laboratory/NASA
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