Mars's clay surface formed in an ancient steam bath

A new theory about the clay on Mars's surface could rewrite the history of the red planet.Previously, researchers have suggested that Mars needed to have had water on its surface to form clay.But the new study suggests that Mars's early atmosphere was a high-pressure steam bath that transformed the planet's solid crust into soft clay.Millennia of volcanic eruptions and asteroid impacts then spread this clay out into the patchy surface we see today.Scroll down for video A new theory about...