Black Holes' Cosmic 'Choir Singers' Finally Identified

Now, new data from NASA's Nuclear Spectroscopic Telescope Array (NuSTAR) spacecraft has begun to identify some of the voices. "We knew this cosmic choir had a strong high-pitched component, but we still don't know if it comes from a lot of smaller, quiet singers, or a few with loud voices," study co-author Daniel Stern, NuSTAR project scientist at NASA's Jet Propulsion Laboratory in Pasadena, California, said in a statement.