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Excerpt from news.google.com
Throughout its history, Earth has undergone five mass extinction events. The most recent was the one that killed all the dinosaurs.
The mass extinction event that wiped out all non-avian dinosaurs 66 million years ago was caused by a giant asteroid that slammed into the Earth.
Not only did this spell the end of an era for dinosaurs, but about 80 percent of animals on the planet were obliterated as well.
After performing an analysis of metal isotopes that were scattered from the impact, scientists think they have now figured out the origin of the asteroid.
It’s not from the main asteroid belt, as previously believed, but from the outer solar system beyond Jupiter.
