Mars is usually a safe 225 million kilometers away from Earth, but what if the red planet went off course and headed straight ...

Normally, younger rocks are deposited above older ones, forming predictable geologic layers. In the North Sea, this process ...

It’s just as well conditions like this are not common, or 18th-century geologists might have never made sense of Earth's ...

Discover a vast, previously unknown world of microbial life that survives—and even thrives—for hundreds of millions of years ...

Earth’s core has two layers. A hot, solid metal sphere of iron and nickel is roughly 70% the size of the moon, with a radius of about 759 miles (1,221 kilometers).