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After 15 years, pulsar timing yields evidence of cosmic gravitational wave background
![NANOGrav_PTA_GWB_15yr750px](https://astro.berkeley.edu/wp-content/uploads/2023/06/NANOGrav_PTA_GWB_15yr750px.jpg)
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.