NICOLLE R. FULLER / SCIENCE PHOTO LIBRARY NICOLLE R. FULLER / SCIENCE PHOTO LIBRARY
Extinction of the dinosaurs, illustration. Early mammals and a herd of Edmontosaurus dinosaurs watching as the Chicxulub asteroid hurtles towards Earth. This asteroid, which hit what is now the Yucatan Peninsula, Mexico, approximately 66 million years ago caused the extinction of the dinosaurs.
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