SPHERES competiton day

ISS036-E-031693 (13 Aug. 2013) --- A close-up view of a bowling-ball-sized free-flying satellite known as Synchronized Position Hold, Engage, Reorient, Experimental Satellites, or SPHERES is pictured during a session in the International Space Station’s Kibo laboratory. NASA astronaut Chris Cassidy, Expedition 36 flight engineer, is visible in the background.