Fresh evidence suggests early Earth wasn’t locked under a rigid stagnant lid but was already experiencing intense subduction.

Far below the familiar blue of the surface oceans, geophysicists are piecing together evidence for a vast, hidden reservoir of water locked inside the planet itself. Instead of filling open caverns, ...

Far from being quiet, frozen backwaters, the icy moons of the outer solar system are starting to look like some of the most ...

Falling birthrates, rising longevity and artificial intelligence will reshape the global economy in the coming century.