Astronaut Karen Nyberg conducts a session with a pair of bowling-ball-sized free-flying satellites known as SPHERES.
ISS036-E-031667 (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 Karen Nyberg, Expedition 36 flight engineer, is visible in the background.