Figure 11-37: R I V U X G
Wet Mars This false-color image shows two signatures of water found by Opportunity. Both the sedimentary rock (exposed by erosion) and the hematite spheres appearing blue require standing water to form. So, this area must have been under water for an extended period. The small spheres are typically a few millimeters in size and in these false-color images are often referred to as “blueberries.”
(NASA/JPL/Cornell)