It's largely agreed upon in the scientific community that a massive impactor was what ultimately doomed the dinosaurs to extinction. Where that object came from has been the subject of debate, but ...

In a geological moment about 66 million years ago, something killed off almost all the dinosaurs and some 70 percent of all other species living on Earth. Only those dinosaurs related to birds appear ...

Artist's rendering of a comet headed towards Earth. (Public domain image) Astrophysicists put forth a new theory to settle the old debate over whether an asteroid or a comet killed the dinosaurs 66 ...