Nearly 66 million years ago, a large asteroid hit Earth and contributed to the global extinction of dinosaurs, allowing the rise of mammals and leaving birds as their only living descendants.

It's been 66 million years since dinosaurs roamed the Earth, and many may blame an asteroid's explosive collision with our planet for the end of the creatures' reign. But for years, scientists have ...

Of all the mysteries surrounding dinosaurs, none has sparked more debate than how their era ended—was it a gradual decline or a sudden catastrophe? A new study led by Andrew Flynn of New Mexico State ...