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Published online 22 October 1998 | Nature | doi:10.1038/news981022-2

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A strange supernova

By the time you have finished reading this sentence, five stars in the observable Universe will have exploded violently, as supernovae. By this time tomorrow - and approximately once a day thereafter - an almost inconceivably powerful source of unknown nature will have showered the Universe with an intense blast of high-energy gamma radiation.

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