Long before the Great Lakes came to define the heart of North America, a much larger lake once ruled the land. Lake Agassiz, a prehistoric inland sea, spread across the continent with a reach that ...

Planetary boundaries outline how far past pre-industrial conditions Earth can get before anthropogenic activity has ...

The Silurian Hypothesis asks whether signs of truly ancient past civilizations would even be recognisable today.

The spacecraft, which snatched a dusty, pebbly sample in October 2020, is currently on its way back to Earth to drop off the precious material. But before it grabbed its sample, OSIRIS-REx spent ...

Researchers have found that ocean acidification entered a "danger zone" in 2020, suggesting increased carbon dioxide levels have caused Earth to breach another planetary boundary.

Astronomers have pulled off an unprecedented feat: detecting ultra-faint light from the Big Bang using ground-based ...

The Earth has had at least five major ice ages, and humans showed up in time for the most recent one. In fact, we’re still in ...

U.S. Army tanks, Bradley fighting vehicles, Paladin howitzers and other military equipment arrived by train to the nation's ...