The composite structure of the rover and lander will be baked with heat coming directly from the Sun, and reflected up from the hot lunar soil. To reflect as much radiation as possible, the Astrobotic team is experimenting with bonding a top Mylar foil layer on to the composite sandwich of carbon fiber fabric and resin that forms the main structure. Last week two four-inch-sqaure test articles were fabricated, one with a gold Mylar top and other other with silver Mylar, co-cured with the composite layers. These pieces will be tested in our vacuum chamber with a heat light to determine their thermal performance. The Mylar layer also shields the resin from the UV spectrum, which causes composite materials to degrade.