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A highly unusual blast of high-energy light from a galaxy some 1.1 billion light years away from Earth may have been caused by the collision of two super-dense stars. The event was detected in December 2021 by NASA’s Neil Gehrels Swift Observatory and the Fermi Gamma-ray Space Telescope. The gamma-ray burst was significantly longer than average, which might normally suggest it had been produced by the collapse of a massive star into a supernova.