Add Yahoo as a preferred source to see more of our stories on Google. A group of hikers look at one of the smoke rings A group of hikers look at one of the smoke rings Europe's most active volcano, ...

Weather experts have been left baffled by a solid black ring which appeared in the sky -- but a former UFO investigator claims it's a Smoke Vortex. SWNS.com Alien hunters say a fresh sighting of a ...

Tourists in Italy have been treated to quite the show as Mount Etna, the largest active volcano in Europe, has been blowing spectacular "smoke rings" into the sky since last week. The rare phenomenon, ...

A mystery black ring dubbed a 'smoke vortex' has baffled drivers and weather experts after being spotted floating through the sky. The bizarre phenomenon was spotted by Kimberley Robinson, 22, as she ...

A smoke ring formed in the sky after a transformer explosion in Branford on Thursday and the mysterious looking formation is called smoke vortex ring. Smoke vortices form when there is a blast through ...

Smoke rings are being seen in a new light. Doughnut-shaped structures called vortex rings are sometimes seen swirling through fluids. Smokers can form them with their mouths, volcanoes can spit them ...

In high school, I once tried to build a smoke-ring-generating vortex cannon out of a five-gallon paint bucket, a t-shirt, and some dry ice. My contraption was a letdown. It produced weak, wispy rings, ...

Tourists in Italy have been treated to quite the show as Mount Etna, the largest active volcano in Europe, has been blowing spectacular “smoke rings” into the sky since last week. The rare phenomenon, ...