Recent flights by NASA’s ER-2 aircraft have uncovered new types of gamma rays generated by thunderstorms. These observations indicate that gamma-ray glows are more common and long-lasting than previously thought, while newly identified flickering gamma-ray flashes might provide insights into the mechanisms behind lightning formation.Recent flights by NASA’s ER-2 aircraft have uncovered new types of gamma rays generated by thunderstorms. These observations indicate that gamma-ray glows are more common and long-lasting than previously thought, while newly identified flickering gamma-ray flashes might provide insights into the mechanisms behind lightning formation.