The sun is midway through its life of fusion. It's about 5 billion years old, and though its life is far from over, it will ...

Lavas from hotspots - -whether erupting in Hawaii, Samoa or Iceland -- likely originate from a worldwide, uniform reservoir in Earth's mantle, according to an evaluation of volcanic hotspots.

A new study offers the most detailed glimpse yet into how Earth's surface temperature has changed over the past 485 million years. The data show that Earth has been and can be warmer than today -- but ...

The best-run city in America, according to data—and see the rest of the 50 best ...