A subtle symphony of ripples in spacetime – astronomers use dead stars to measure gravitational waves produced by ancient black holes
Chris Impey, University of Arizona An international team of astronomers has detected a faint signal of gravitational waves reverberating through the universe. By using dead stars as a giant network of gravitational wave detectors, the collaboration – called NANOGrav – was able to measure a low-frequency hum from a chorus of ripples...
