MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Dinosaur extinction. Artwork of dinosaurs beneath a comet display (upper left) at sunset. Such a display may have preceded the catastrophic impact event some 65 million years ago that is thought to have led to the extinction of the dinosaurs. The impact would have thrown trillions of tonnes of dust into the atmosphere, blocking out sunlight and leading to a catastrophic cooling of the Earth's climate.
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