Why it matters: While not evidence of life, these discoveries show that ancient Mars had complex organic chemistry, ...

A clay-rich mesa in the Hellas basin of Mars. The blue color near the rim is aluminum bearing clays. The red-orange color below that is iron and magnesium bearing clays. The image captures an area ...

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Spiderweb-shaped rock patterns on Mars may rewrite the timeline of when water disappeared from the Red Planet.

Mars' atmosphere is one of the planet's most scientifically controversial characteristics. We know that the Red Planet's atmosphere is incredibly sparse, but mounting evidence suggests it once ...

A new climate model suggests that ancient lakes on Mars may have survived for decades beneath thin layers of ice that formed and melted with the seasons. The findings help resolve a long-standing ...

For the first time, scientists have found a large, watery lake beneath an ice cap on Mars. Because water is essential to life, the discovery offers an exciting new place to search for life-forms ...