V404 Cygni (IMAGE) Instituto de Astrofísica de Canarias (IAC) Caption Researchers of the IAC participate in a study, in which they have measured the delay between the X-rays and the visible light of a jet emitted by a black hole. Observations, carried out from the Roque de los Muchachos Observatory, combined with NASA's NuSTAR satellite, shed light about the nature of its formation Credit Gabriel Pérez, SMM (IAC). Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.