An asteroid impact, not volcanism, may have made Earth unlivable for dinosaurs
New simulations add to evidence that the Chicxulub strike is what killed T. rex and its kin
![Earth about to be hit by asteroid](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2020/07/070920_ms_chicxulub_feat.jpg?fit=1028%2C579&ssl=1)
When a 10- to 12-kilometer-wide asteroid (bright light in this illustration) struck what is now the Yucatán Peninsula in Mexico 66 million years ago, it pulverized tons of Earth’s crust, sending a humongous cloud of dust into the sky and blocking out the sun for decades.
Gabriele Chiarenza