gas disk

Black holes can only grow to the limit of 50 billion solar masses before losing their energy source and stopping growth.

American astronomers say they have discovered six possible objects, comets around distant stars, a sign that comets are also popular out there rather than a special feature of the

The mystery of the formation of young stars under the giant gravity of black holes has been revealed by a group of astrophysicists at the University of St Andrews and Edinburgh.