Arizonasaurus was an archosaur from the Middle Triassic.

Around 66 million years ago, the reign of the dinosaurs came to a fiery end. An asteroid about 7 miles (12 kilometers) wide, flying at 27,000 mph (43,000 km/h), slammed directly into Earth. The impact ...

Artist's rendering of the Chicxulub asteroid entering Earth's atmosphere 66 million years ago, triggering events that caused a mass extermination. Roger Harris/Science Photo library via Getty Images ...

When it comes to dinosaur extinction, the working idea is what’s called the bolide impact. This is the hypothesis that a meteorite came to the surface of the Earth, hit the Earth and led to the ...

Rock layers deposited before and after the major dinosaur extinction event 65 million years ago are surprisingly different.

Sixty six million years ago, an asteroid the size of Mount Everest hurtled toward Earth, setting in motion an extinction event that would change life forever. The impact wiped out the largest and ...

How did dinosaurs become birds—and what good is half a wing? How did dinosaurs become birds—and what good is half a wing? Join Joe and a few brave chickens as they recreate a brilliant experiment that ...

This article explores the major extinction events that influenced dinosaur survival and their eventual extinction, breaking down the causes, effects, and lasting legacy of these world-changing moments ...