quasi periodic oscillation

The death cry of a star being destroyed by a black hole

Stars suffer, too, you know. Astronomers have recently discovered a distinctive X-ray signal coming from a star on the verge of being engulfed by a black hole in a distant galaxy. “This tell-tale signal, called a quasi-periodic oscillation or QPO, is a characteristic feature of the accretion disks that often surround the most compact objects [...]