Astronomers from the Astrophysikalisches Institut in Potsdam, Germany, discovered the most luminous X-ray cluster ever to be detected at a distance of nearly 8 billion light years away from Earth. Only a handful of galaxy clusters are believed to exist ...

A new study by researchers from the US and Chile suggest there is an upper limit on the mass of black holes. Using a variety of observational data they trace the accretion history of black holes, from which the mass ...