Astronomers detected two supermassive black holes (SMBHs) orbiting each other, within a giant elliptical galaxies. The SMBHs are 24 light years apart and have a combined mass of about 15 billion times the mass of our Sun. It takes them about 30,000 years to complete a single orbit
Gamma-ray Bursts (GRBs) are the most violent explosions in the universe after the Big Bang. Recently a team of astrophysicists tried to answer what causes the wide range of their spatial offset from their host galaxies.
The Hard X-ray Modulation Telescope (HXMT) is the first astronomical satellite of China
Supermassive black holes exist in the centre of most, if not all, galaxies. An open question in astrophysics, however, is how these enormous black holes, that weigh billion times the mass of the sun, existed in the early universe.