Astronomers detected a strong signal from space lasting seven hours. Now they may have worked out what it was
Gamma-ray bursts (GRBs) are intense sources of high-energy radiation that scientists detect on Earth in the form of gamma rays. They were first detected in the 1960s by US military satellites looking for nuclear detonations on Earth, which saw bright bursts of gamma rays coming from the sky. They didn’t know what they were, but