Cosmic “touchdown airbursts” — explosions of comets or asteroids above Earth’s surface — may be far more common and destructive than previously thought, according to new research. Unlike ...

It’s what a Virginia Tech athletics equipment manager asked Stefan Duma, a faculty member at the university’s department of Biomedical Engineering and Mechanics, in 2009. Duma’s team had been working ...

A nuclear winter is a theoretical concept, but if the climate scenario expected to follow a large-scale nuclear war, in which smoke and soot from firestorms block sunlight, came to fruition, global ...