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After 15 years, pulsar timing yields evidence of cosmic gravitational wave background
Artist’s interpretation of an array of pulsars being affected by gravitational ripples produced by a supermassive black hole binary in a distant galaxy. (Image credit: Aurore Simonnet, NANOGrav collaboration) University of California, Berkeley Astronomy research groups lead by Professor Chung-Pei Ma and Assistant Adjunct Professor Luke Zoltan Kelley have just published papers supporting the widespread conclusion that the universe is full of low frequency gravitational waves.