Although some scientists have suggested for decades that an asteroid may have killed the dinosaurs, others have disagreed. The dates of major collisions around the earth and the demise of our loved beasties just didn't seem to occur at the same time. The asteroid theory remained the favored idea of all of us kids out there who wanted a nice, clean explanation for why I can't ride a Triceratops down the street.
Now, it turns out, the age estimates of the Chixulub crater were by around 100,000 years. It did happen at around the same exact (geological) time that the mass extinction of Earth species occurred 65 million years ago. Sure, there was also a great deal of volcanic activity around then that would have weakened the dinos, but the asteroid finished them off!
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