Secrets to Mars Water Hidden in Volcanic Remains

Scientists have become increasingly convinced in recent years that Mars, which now appears mostly dry on the surface, was once warm and wet — the sort of place where life might have got a toehold and possibly even flourished. But looming questions have formed around this expectation: Where did the water come from, and for how long was the Red Planet wet? A new study points a finger at one of the most obvious features on Mars, a hulking, elevated region known as the Tharsis rise that may have released tremendous amounts of lava, along with water and carbon dioxide that combined to possibly create a habitable planet. The research also narrows the range of time, under this scenario, that Mars would have been wet.