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What Causes Gamma-Ray Bursts? Their Ultrabright Flashes Hold Clues

To revist this article, visit My Profile, then View saved stories. In July 1967, at the height of the Cold War, American satellites that had been launched to look for Soviet nuclear weapons tests found something wholly unexpected. The Vela 3 and 4 satellites observed brief flashes of high-energy photons, or gamma rays, that appeared to be coming from space. Later, in a 1973 paper that compiled more than a dozen such mysterious events, astronomers would dub them gamma-ray bursts. “Since then, we’ve been trying to understand what these explosions are,” said Andrew Taylor, a physicist at the German Electron Synchrotron (DESY) in Hamburg.

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