A subtle symphony of ripples in spacetime Astronomers use dead stars to measure gravitational waves produced by ancient black holes

A giant white reflective dish with a receiver.

An international team of astronomers has detected a faint signal of gravitational waves reverberating through the universe. Using dead stars as a giant array of gravitational-wave detectors, the collaboration called NANOGrav was able to measure a low-frequency hum from a chorus of spacetime ripples. I am an astronomer who studies and has written on cosmology, … Read more