On the Cover: This false-color composite image, taken by Opportunity in a region close to its landing site dubbed “Opportunity Ledge,” shows finely layered sediments that have been accentuated by erosion. The sphere-like grains, or “blueberries,” distributed throughout the outcrop are geologic features called concretions that form in preexisting wet sediments. This image was taken by Opportunity’s panoramic camera on the 50th Martian day, or sol, of the mission. NASA/JPL/Cornell
4 We Make it Happen! The Planetary Society on Mars: Bruce Bettsshowcases the Society's latest Mars-related projects.