For generations, we believed life depended on sunlight, air, and space. Forests, oceans, and soil seemed its only homes. Solid rock, buried miles beneath Earth's surface, was presumed lifeless. That ...

Deep within Earth’s core, scientists are uncovering signs of a hidden structure that challenges long-standing models of the planet’s interior.

In the early 1990s, eight people agreed to vanish from the world and live for two years inside a sealed glass habitat in the Arizona desert, a kind of fake Earth built to see whether humans could ...