Rather than a constant upward trajectory of evolution, it’s been billions of years of boom-and-bust cycles – first an explosion of life, and then a mass extinction of all but the most hardy hangers-on ...

A new study of ancient fossil trails pushes the origins of complex life deeper into Earth’s history, before the Cambrian Period began.

New fossil evidence suggests the Cambrian Explosion, once thought to have occurred 530 million years ago, may have begun 15 million years earlier.

The Star Wars galaxy spans thousands of years, with distinct eras shaping the rise and fall of civilizations, Jedi, and Sith.