After a seven-year trip, the Cassini spacecraft arrived at Saturn in July 2004.
How the North Atlantic Oscillation kicks up a commotion in the Northern Hemisphere.
How satellite data helps scientists map changes in one of Earth's great wildernesses.
To what lengths do scientists have to go to snare a gravitational wave?
One of the most abundant forms of ocean life is gelatinous goo.
Learn how communities in Thailand restored mangrove forests for the benefit of all.
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?