This is an artist's depiction of a huge meteorite striking Earth 65 million years ago, sending the dinosaurs and many other life forms into extinction. A collision 160 million years ago of two asteroids orbiting between Mars and Jupiter sent many big rock chunks hurtling toward Earth, including the one that zapped the dinosaurs, scientists said on September 5, 2007. The researchers, led by William Bottke of the Southwest Research Institute, said debris from the collision also pelted the moon.
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