Wet places on ancient Mars

Wet places on ancient Mars

Fig. 8.22 . A color-enhanced image of a delta in Jezero Crater obtained from an instrument aboard the Mars Reconnaissance Orbiter. A system of river channels apparently eroded clay minerals (green) out of the highlands and concentrated them into a crater lake, forming the delta. The distribution of clays inside the ancient lakebed suggests that standing water persisted for thousands of years in this location, and that liquid water may have persisted for thousands to millions of years as the clay formed, albeit more than 3.5 billion years ago. [Courtesy of NASA/JPL/JHUAPL/MSSS/Brown University. Bethany L. Ehlmann and colleagues, Nature Geoscience 1, 355-358 (2008).]

Copyright 2010, Professor Kenneth R. Lang, Tufts University