A rock sample used to reexamine Earth's pre-GOE "whiff of oxygen" spans the Archean and Paleoproterozoic time periods. This illustration depicts what the Earth might have looked like billions of ...

Earth was once ruled by giant reptiles. Tyrannosaurus rex, the king of tyrant lizards, crushed bones. Spinosaurus hunted in ...

New research suggests ancient Mars may have been warm and wet, with rainfall or snowmelt carving its iconic valleys.

Ancient Homo sapiens may have benefited from sunscreen, tailored clothes and the use of caves during the shifting of the ...

The Sahara Desert is one of the driest and most barren regions on Earth ... "At the time, Takarkori was a lush savannah with a nearby lake, unlike today's arid desert landscape," said ...