"15-Year Pulsar Timing Unveils Cosmic Background Gravitational Waves Humming in Our Universe"
Researchers from the NANOGrav collaboration have published evidence of cosmic background gravitational waves after 15 years of observing millisecond pulsars in the Milky Way galaxy. The precise rhythms of these pulsars were found to be affected by the stretching and squeezing of spacetime caused by long-wavelength gravitational waves. The researchers suggest that the hum is likely produced by pairs of supermassive black holes merging over the history of the universe. The findings open up a new window for gravitational-wave astronomy and provide insights into the population of supermassive black hole binaries.
