Black holes are much more numerous. They also evolved differently than researchers would have expected. A Penn State astronomer informed according to data from X-ray observatory surveys.



Dr. Niel Brandt, professor of astronomy and astrophysics says, “We wanted a census of all the black holes and we wanted to know what they are like... We also wanted to measure how black holes have grown over the history of the Universe.”



Using NASA’s Chandra X-ray Observatory, looking at a patch of sky in the Northern hemisphere called the Chandra Deep Field-North and a similar patch in the Southern hemisphere called the Extended Chandra Deep Field-South, Brandt and other researchers have done just that. Using both Chandra and the European Space Agency’s X-ray Multi-Mirror Mission-Newton, surveys are also being carried out in other parts of the sky.



Via: eurekalert