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It's been more than 30 years since UC Berkeley researchers first suggested that the extinction of the dinosaurs was probably linked to a massive comet or asteroid impact, known as Chicxulub, off the Yucatan coast. The idea was that the collision from space, which left a 110-mile-wide crater off the coast of Mexico, would have cast off debris that wrapped all the way around Earth, altering the climate and resulting in the global extinction.