Astronomers Nearly Double Known Cosmic X-Ray Sources, Spotting 2 Million Active Black Holes
A breakthrough sky survey has dramatically expanded our view of the high-energy universe. Astronomers have nearly doubled the number of known cosmic X-ray sources, cataloging roughly 2 million active black holes, along with supernova remnants, neutron stars, and other intensely energetic objects.
The findings come from a deep X-ray survey