During this process, they release energy in the form of gravitational waves that reverberate throughout the universe - waves astronomers now say they have detected. They say the signals may be coming from merging supermassive black holes that are caught in cosmic dances, circling each other in orbits that shrink across millions of years. Hints of the same signal were announced in a series of papers published by scientists in China, India, Europe and Australia. (Image credit: Aurore Simonnet for the NANOGrav Collaboration) Artist's interpretation of an array of pulsars being affected by gravitational ripples produced by a supermassive black hole binary in a distant galaxy.
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