When a massive star collapses or two neutron stars collide billions of light-years away, the explosion can unleash a brief, blinding flash of gamma rays. Catching that flash and pinpointing its origin ...

For the first time, scientists have caught lightning in the act of unleashing a powerful burst of gamma radiation known as a terrestrial gamma-ray flash (TGF). Researchers at the University of Osaka ...

Above the cloud tops, thunderstorms throb with a complex, frenetic light show of high-energy radiation. A view from a retrofitted spy plane soaring at 20 kilometers up revealed storms glowing and ...

COSI is a NASA Small Explorer (SMEX) satellite mission scheduled for launch in 2027. The wide-field gamma-ray telescope is designed to survey the entire sky at 0.2-5 MeV. It will provide imaging, ...