Throughout Earth's history, ice caps have been very rare, but a model of the past 420 million years suggests an explanation ...

A new study rewrites the story of human evolution, suggesting that intelligent life is not rare but a natural planetary process rather than an improbable event.

In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small and in the Milky Way, while Curtis took a more radical position that they ...

The California coast has been rocked by seven earthquakes in less than a day, including four in the same city near the San ...

At the top of the world, there is a sea—the remains of one, at least. The summit rocks of Mount Everest, the highest ...

New study reveals that Earth's inner core is undergoing unexpected structural changes, challenging long-held assumptions ...

President Trump’s moves to pause refugee resettlement, freeze foreign aid and suspend funds to promote democracy have added ...

Quipu, Hercules, Serpens–Corona Borealis and Sculptor–Pegasus are all larger than the fifth and final superstructure ...

Experts say portions of the continent are pulling apart, creating the possibility that the Horn of Africa will become an island.

A team of geologists and mineral physicists at Harvard University, the University of California, Argonne National Laboratory ...

New research suggests an ancient hotspot helped shape the Great Lakes, challenging traditional formation theories.

Dust off your old science textbook from grade school and you’ll probably find a familiar illustration of the Earth sliced in half, revealing the planet’s layers, from the crust down to the core — ...