Wakata and Mastracchio during SPHERES session

ISS038-E-000068 (10 Nov. 2013) --- In the International Space Station?s Kibo laboratory, Japan Aerospace Exploration Agency astronaut Koichi Wakata (left) and NASA astronaut Rick Mastracchio, both Expedition 38 flight engineers, conduct a session with a pair of bowling-ball-sized free-flying satellites known as Synchronized Position Hold, Engage, Reorient, Experimental Satellites, or SPHERES.