These ghostly hoops have been spotted above volcanic events around the world. But how they form has long been a mystery.

Some scientists think we can better understand volcanoes by learning how the gaseous vortexes emerge. By Carolyn Wilke Some volcanoes perform a rather subtle trick: blowing rings of vapor that waft ...

One suspect has been apprehended and three or four additional suspects are expected to be arrested as part of an effort by local police departments to break up a business-burglary ring that hit up to ...

Some volcanoes perform a rather subtle trick: blowing rings of vapor that waft near their craters. The short-lived rings have been observed occasionally at volcanoes such as Etna in Italy and ...