"We wanted to identify the origin of this impactor," says Mario Fischer-Gö dde, an isotope geochemist at the University of Cologne in Germany. To find out what the object was and where it came from, he and his colleagues obtained samples of K/Pg rocks from three sites, and compared them with rocks from eight other impact sites from the past 3.5 billion years."
"The findings suggest that the mass extinction was the result of a train of events that began during the birth of the Solar System. These observations bolster the case that the Chicxulub impactor was an asteroid from the outer Solar System."
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