Water once flowed on Mars—perhaps enough to harbor life.
Oxygen is the key to Earth's biodiversity. But it wasn't always so.
Watch roads and parking lots multiply around the threatened Chesapeake Bay.
Will Vietnam's biodiversity vanish faster than biologists can document it?
New insights into a rare, destructive wind storm.
Two technologies to find and describe faraway planets.
Scientists are studying earthquakes from far above the tremors.
The Universe's oldest light is cosmologists' window to the past.
The Arctic National Wildlife Refuge is rich in oil. What’s at stake?
Earth is increasingly vulnerable to the power of solar storms.