Astronomers around the world are captivated by an unusually bright and long-lasting pulse of high-energy radiation that swept over Earth Sunday, Oct. 9. The emission came from a gamma-ray burst (GRB) – the most powerful class of explosions in the universe – that ranks among the most luminous events known. On Sunday morning Eastern time, a wave of X-rays and ...

NASA will provide live coverage with commentary of the upcoming Artemis I cryogenic demonstration test beginning at 7:15 a.m. EDT on Wednesday, Sept. 21. The demonstration test will allow teams to confirm the repair to a hydrogen leak seen during an early September Artemis I launch attempt, evaluate updated propellant loading procedures, and conduct additional evaluations. The demonstration will conclude when the objectives for the ...