Instead, Mars' red color is better matched by ferrihydrite — an iron oxide that contains water — and so the hue must have ...

Mars, once a planet abundant with water, now lies as a barren, arid expanse. Its surface features reveal a history where ...

Liquid water has been observed on the planet Mars, the US space agency NASA said Monday. "Mars is not the dry, arid planet we thought of in the past," Jim Green, NASA's planetary science director ...