Scientists using NASA’s Curiosity rover have discovered siderite—an iron carbonate—in the sulfate-rich rocks of Gale Crater, ...

NASA’s Curiosity rover has uncovered new evidence that ancient Mars may have been able to support life. Researchers found ...

“But up here on the crater rim, there are new and intriguing rocks everywhere the rover turns ... formed at least 3.9 billion years ago during Mars’ earliest geologic period, and may have ...