Rare fossils in New Mexico reveal dinosaurs were doing just fine before the asteroid annihilated them all

Alamosaurus was among the last dinosaurs in southern North America when the asteroid hit. (Image credit: Natalia Jagielska)

Some of the last dinosaurs in the world were healthy and thriving right up until the day they were annihilated by asteroid Armageddon, a new study on fossils from New Mexico finds.

Scientists have debated for decades whether non-avian dinosaurs were in decline before a massive asteroid struck Mexico's Yucatán Peninsula at the end of the Cretaceous period (145 million to 66 million years ago). The new study, published Thursday (Oct. 23) in the journal Science, supports previous evidence that the dinosaurs were struck down in their prime and might have still roamed Earth if it weren't for that pesky asteroid.