Scientists are exploring the possibility of a looped universe, where space folds back on itself like a hall of mirrors. New ...

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.

This article was published in Scientific American’s former blog network and reflects the views of the author, not necessarily those of Scientific American In the Star Trek: The Next Generation episode ...

NASA’s Cassini spacecraft is helping scientists see the structure and hour-to-hour changes of a giant doughnut-shaped gaseous ring around Jupiter in unprecedented detail. The doughnut, called the Io ...