There are moments in the history of human thought when a simple realization transforms our understanding of reality. A moment ...

Most of the long-period comets in the Solar System come from the outer Oort Cloud. The inner region is much more stable. It's ...

Now, a new model suggests that the inner part of the Oort Cloud may have an unexpected structure resembling a spiral, much like a miniature galaxy. The Oort Cloud begins roughly 2,000 – 5,000 ...

The mysterious Oort cloud is the source of many of our solar system's comets, but astronomers still have no idea what it looks like. Now, new simulations may have given them a first glimpse.