The fossil that proves a meteor killed the dinosaurs

Paleontologists find a clue that seems to contradict the theory that dinosaurs went extinct gradually

A dinosaur exhibit at the Natural History Museum in New York: A three-horned triceratops fossil found in Montana proves that dinosaurs died as a result of an abrupt global disaster, scientist
(Image credit: Bill Varie/CORBIS)

Scientists have long debated how the dinosaurs met their end. Did a massive meteorite wipe them out quickly, or did the Age of the Dinosaurs end gradually? A new finding might settle the argument for good. Here, a brief guide:

What was this crucial discovery?

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