A picture portraying a UFO flying. A crack of lightning, a burst of heat, and suddenly a glowing sphere hangs in the sky like a craft from another world. Scientists now say this is not fantasy or ...

UNIVERSITY PARK, Pa. — Lightning formation and the conditions triggering it have long been shrouded in a cloud of mystery, but new research led by Penn State scientists is lifting the fog. Using ...

For centuries, witnesses have described luminous spheres appearing during or after thunderstorms. The reported objects may hover, drift, pass near buildings and vanish quietly or with a sharp sound, ...