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The supernova hypothesis

Image caption:
An existing hypothesis proposed that a supernova at the end of the Cretaceous had caused the extinction of dinosaurs. Supernovas throw off heavy elements like iridium — so the hypothesis seemed to fit with the team's discovery of high iridium levels.

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If you use this image in your own non-commercial project please credit it to the University of California Museum of Paleontology's Understanding Science (http://www.understandingscience.org).


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