VELA FLASH
A US satellite detected a mysterious flash in 1979; the CIA said it was probably a nuclear test, but nearly 50 years later, the mystery remains unsolved
In 1967, US satellites searching for nuclear tests detected mysterious flashes from space. Decades later, scientists uncovered secrets of gamma-ray bursts, which can release more energy in 10 seconds than Sun will emit over its entire 10-billion-year lifetime
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