Universe's hidden supermassive black holes revealed

Astronomers have found evidence for a large population of hidden supermassive black holes in the Universe. Using NASA's Nuclear Spectroscopic Telescope Array (NuSTAR) satellite observatory, the team of An illustration of the NuSTAR satellite observatory in orbit. The unique 10 metre long mast allows NuSTAR to focus high energy X-rays. Credit: NASA/JPL-Caltech. Click for a full size imageinternational scientists detected the high-energy x-rays from five supermassive black holes previously clouded...