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Two astronomers are discussing supernovas. Dr. Frank says, “Research has established that if supernova occurs within ten light-years of the Earth, then life on Earth will be destroyed.” Dr. Harris say, “Research has also established that either a supernova will not occur within ten light-years of the Earth or life on Earth will not be destroyed.” Is it possible that both astronomers are correct? If so, what can we determine about the occurrence of a supernova?
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