DAVID A. HARDY / SCIENCE PHOTO LIBRARY DAVID A. HARDY / SCIENCE PHOTO LIBRARY
Artist's impression of a Tyrannosaurus rex at the moment when an incoming giant meteorite or asteroid led to the devastating changes on Earth that caused the extinction of the dinosaurs & many other life-forms some 65 million years ago. The theory that the mass extinction was caused by such an event has recently received some support from geological evidence, though numerous other explanations have been put forward.
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