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One of the greatest mysteries of all is what causes gamma ray bursts. These bursts are the most powerful explosions in the Universe and occur about once a day. Their origin is unknown, although there are several theories. Students learn about NASA's Swift mission, with a specially-equipped satellite to further explore the causes of gamma ray bursts. This activity is part of the Great Explorations in Math and Science guide entitled "Invisible Universe: The Electromagnetic Spectrum from Radio Waves to Gamma Rays" that features five activities. It is available for purchase from the website.