A giant wave of undulating gas and dust appears, per new research, to have engulfed our Solar System millions of years ago.

The edge of the Solar System is a strange place, full of oddities we've only just begun to probe. But perhaps the oddest of all is the Oort Cloud, a vast field of icy debris extending out to 100,000 ...

Even the little-understood Oort Cloud, at the outer edges of our solar system beyond view, has a partly spiral structure.