MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Artwork of a tyrannosaurus seen against a setting or rising sun. Tyrannosaurus was one of the very last dinosaurs, wiped out 65 million years ago during the extinction event that ended the Cretaceous period. Scientists believe that the incident was provoked by the impact of an asteroid or comet with the Earth off the coast of what is now Mexico. In this image, a comet is seen in the sky - perhaps the very comet that will one day spell doom for the dinosaurs.
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