When it comes to the fall of the Roman Empire, this climate shift may have been the straw that broke the camel’s back.” ...

Some of the unusual rocks carry stories about water on Mars. One has hints of long-gone microbes. All tell of a dynamic, complex planet.

NASA’s Curiosity rover has uncovered intriguing traces of sulfur crystals embedded in Martian rock formations, adding weight to the theory that ancient Mars may have supported microbial life. The ...

Crystals inside a Martian meteorite hint that there may have been plentiful hot water on Mars when the rock formed 4.45 billion years ago. The rock, nicknamed Black Beauty, was blasted into space ...

More than 4,000 naturally occurring minerals ... rocks. It's only when they are cut and polished that they obtain the brilliance and luster that gives them their value. Historically, gems have ...