The asteroid that ended the age of dinosaurs left almost nothing of itself behind — it vaporized on impact. But a new study says scientists have finally pinned down what kind of object it was, and the answer complicates a decades-old assumption about how it killed. Tracing an Object That No Longer Exists The Chicxulub impactor struck what is now Mexico's Yucatán Peninsula … [Read more...] about New research says rare meteorite struck Mexico and dust, not sulfur, drove dinosaur die-off