Add Yahoo as a preferred source to see more of our stories on Google. Imagine that you want to know the most efficient way to make a torus—a doughnut-shaped mathematical object—from origami paper. But ...

Using ESA’s Integral and XMM-Newton observatories, an international team of astronomers has found more evidence that massive black holes are surrounded by a doughnut-shaped gas cloud, called a torus.

whole new light, or lack of light, as the case may be here,” said Dr.