It also determined the inner radius of the doughnut-shaped torus of supermassive black hole NGC 4151 to be approximately 0.1 ...

Scientists have discovered more about the process that causes black holes to "leak" energy to their surroundings, finding the faster they spin, the more energy is extracted.

It is the most difficult of the three to spot under light-polluted or hazy skies. NGC 4151 in Canes Venatici is a bright ...