In 1967, US satellites hunting secret nuclear tests detected a flash from deep space; the accidental signal became the first observed gamma-ray burst

Gamma-ray bursts are among the most powerful explosions observed in the universe. First accidentally detected by Vela satellites in 1967, they puzzled scientists for decades. Research later showed that these bursts come from distant cosmic events, including massive stars collapsing and neutron star mergers. Yet their powerful jets still hold mysteries.
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