Earth

Medieval poets, including a Japanese noble, provided key descriptions to track down solar events

Science writer Hanne Strager explores how the trailblazing Danish seismologist Inge Lehmann overcame self-doubt to discover that Earth has a solid inner core, overturning the long-held belief that it was liquid

Scientists are designing techniques to smash up space rocks that could be headed our way

Scientists have found the oldest direct evidence for tectonic motion on Earth by more than half a billion years

Rising sea levels are slowing Earth’s rotation, lengthening days by 1.33 milliseconds per century

These amorous creatures could put Casanova to shame—from beguiling dancing seahorses to peacocking spiders

Fiber optics that connect the world can detect its earthquakes, too

The Hayli Gubbi volcano, long thought to be dormant, sent ash nine miles into the sky in an eruption on Sunday

These valuable but difficult-to-extract metals are increasingly important to modern life

Thousands of years ago, a space rock hit what is now China, leaving a bowl-shaped crater some 900 meters wide

Bird flu surges and a government shutdown collide, complicating efforts to track cases and protect flocks.

Camels in ancient Arabia may have led hunter-gatherers through deserts once thought uninhabitable