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Science in the news: Dinosaurs' disappearance no longer a mystery
Ross, H. 1991.  Facts and Faith 5(3):1-3. CELD ID 6368

Abstract
When I was a graduate student in astronomy at the University of Toronto, three colleagues and I stayed up late one night calculating the frequency with which asteroid and comet impacts and nearby novae and supernovae would have wiped out Earth's large land animals. Based on the data we had gathered in our studies, we concluded that large-scale extinctions should occur at least once every ten million years. The thought then entered my mind that such astronomical disasters could explain many of the gaps we see in the fossil record. It seemed obvious, too, that some kind of divine intervention was necessary to explain the sudden reappearance of new species.