What Killed The Dinosaurs? New Discovery In Africa Hints At Multiple Asteroid Strikes, Say Scientists
ForbesAPR 20 2022
Researchers from Germany's University of Cologne have found that the asteroid that hit Earth 66M years ago, causing the extinction of the dinosaurs, was a "C-type" asteroid, which are rich in carbon and formed around the same time as the solar system beyond Jupiter's orbit.Researchers from Germany's University of Cologne found that the asteroid that hit Earth 66M years ago, causing the extinction of the dinosaurs, was a "C-type" asteroid, which are rich in carbon and formed beyond Jupiter's orbit around the same time as the Solar System.
By analyzing the remains of the crater where the asteroid hit Earth in what is now Mexico, called the Chicxulub impact, the scientists discovered the isotope ruthenium, which is commonly found in asteroids but not in the Earth's crust.
They compared debris from the Chicxulub impact that they found in Italy, Spain, and Denmark to rocks from eight other impact sites that were made over the last 3.5B years.
While the comet theory was justified given the prevalence of carbonaceous chondrites in long-period comets, the discovery of ruthenium proves it was more likely to have been a outer Solar System asteroid. The rocks from the impact site were from C-type asteroids, while the others were found S-type, which are from the inner Solar System.