NanoSail-D2
NanoSail-D2 was a small satellite built by NASA's Marshall Space Flight Center and Ames Research Center to study the deployment of a solar sail in space. It was a three-unit CubeSat, measuring 30 cm × 10 cm × 10 cm (11.8 in × 3.9 in × 3.9 in) with a mass of 4 kg (8.8 lb).