NANOGrav picks up signal of cosmic “choir” of supermassive black holes

Array of exotic stars called millisecond pulsars serves as celestial metronomes.

https://arstechnica.com/science/2023/06/nanograv-picks-up-signal-of-cosmic-choir-of-supermassive-black-holes/?utm_brand=arstechnica&utm_social-type=owned&utm_source=mastodon&utm_medium=social